Pinkbike Poll: Have You Ever Broken Carbon Fiber Cranks?

Sep 24, 2021 at 14:01
by Mike Levy  
There is one massive man made rock garden.
A carbon fiber crank's worst nightmare: the man-made rock garden from the 2019 Snowshoe World Cup. This is part of the cross-country course.

If you were to judge by the comment section alone, you might think that roughly eighty percent of all carbon fiber cranks ever sold have also sheared in half. You might also get the impression that it was only thanks to the good graces of whoever's running our simulation that those riders, with $800 splinters embedded deep into one leg, didn't also perish from fatal fiber poisoning that claims one in every ten weight weenies.

With those cold, hard facts staring you in the face, do you really want to risk your life to save half the grams that a relaxed visit to the loo can eject? And why am I thinking to myself that I should just save even more weight by doing both?

Sure, while that's all puffed up beyond reality, a certain Huck to Flat video recently had many riders sharing their experiences with broken carbon cranks. And by "many," what I really mean is way more than I would have expected. It's certainly not limited to a single brand or two, either, with failures being reported across completely different designs and even seen very publicly under one of the quickest World Cup racers alive.

Unfortunately, it's often difficult to narrow down the precise cause of the failure after it's happened, as we discovered. Is the root origin of your crank's failure a rock strike, or were they just not durable enough? The answer is probably yes, but also maybe probably. Point is, anything can break if you try hard enough, and thirty seconds on the Google reveals scores of failed aluminum bits, so it's not like carbon has the exclusive monopoly on trail-side failures.

Even so, it's painfully obvious that carbon fiber isn't the ideal material to be dragging through pointy rocks at speed, isn't it?


Have you broken a carbon fiber crank?



Have you broken an aluminum crank?




326 Comments

  • 321 6
 I need a poll option for. "I've never fully broken a carbon crankset, but every set I've ever had ends up with some sort of play in it, spindle issue, creaking, pedal threads ripping out, etc."
  • 17 2
 This! ^
  • 90 7
 That definitely counts as broken. Almost every single set of race face/easton carbon cranks end this way.
  • 15 2
 oh yah true - I've never broken one but had to warranty some Next SL because the threads loosened.
  • 24 4
 I see you also tried race face cranks...
  • 70 251
flag andeh23 (Sep 27, 2021 at 12:21) (Below Threshold)
 Yep, I haven't "broken" carbon cranks, but had to get Next arms replaced under warranty twice because the inserts started to debond from the arm.
  • 59 0
 Yeah, that's called breaking
  • 16 1
 5 sixc warranties, for either the pedal insert or that inside plug (whatever it is) cracking and falling out.
  • 42 0
 Threads and spindles coming loose = broken crank arm in my books.
  • 8 0
 @Jaib06: All the old PB+ users tags changed to outsider tags, wait few months then blame people lol
  • 13 0
 Surprisingly my descendant carbon cranks have been mint after 3 years of smashing.
  • 3 1
 @Jaib06: haha class!! Here it begins!!
  • 3 1
 race face
  • 7 0
 @makripper: with no play at spindle or pedal inserts? that's amazing - you got a Tuesday morning batch - none of that Friday afternoon crap.
  • 7 1
 Came her to say the same thing. If the metal piece that the pedal threads into coming loose counts as broken, then yes.
  • 5 0
 I warranty on 2 next sl on trail bike(probably riding harder that what they built for) but my e13 lgr1 still good after 2 years of heavy park use.
  • 20 7
 @andeh23: Badge of dishonor.
  • 3 0
 Hmm. This happened to me, and backcountry blamed it on my pedal installation. I've installed scores of pedals on dozens of bikes, so I was pretty sure it *wasn't* my fault but certainly couldn't prove it. I didn't realize it was a common failure mode. That's good to know.
  • 3 0
 @shredddr: lol knock in plastic. I will probably break them on my ride tonight then. How's the warranty?
  • 1 0
 @makripper: Mine were RF and their warranty was awesome, but then I'm just kicking the can down the road, aren't I? I think the SRAM ones do hold up better though lots seem to fail. RF at the spindle and SRAM at the pedal interface. Not sure on the SRAM warranty.
  • 1 0
 Yep, 2X cranks (sram and RF) that loosened up at the drive side spindle interface. 1 Bent Alu crank from a pedal strike on a rock.
  • 2 0
 @notthatfast: I work in a bike shop and I have counted 5 easton replacement from the same person. The chainring mount got always loose.
  • 1 0
 @adrennan: Haha!! So true. But I do love them.
  • 1 1
 @flattoflat: it's like you don't seem to understand the pinkbike comment section...
  • 1 0
 I haven’t had my carbon cranks long enough to have really put them through the test. Seems like I’m in for some disappointment down the road judging by the comments. Probably definitely replace them with XT if/when the time comes.

Here’s the thing — my current carbon cranks replaced NX Eagle. Whatever the upgrade between the two are supposed to be, weight is barely one of them. The “low end” NX cranks are deceptively light, maybe an ounce or two heavier. (I don’t remember exactly). I probably would have gotten the same bang for a lot less bucks by going GX.
  • 2 0
 @makripper: same - been very happy with them, first carbon crankset
  • 18 143
flag JakeEPooh (Sep 27, 2021 at 17:14) (Below Threshold)
 @andeh23: Hahaha, you're getting downvoted because you're one of those soulless tools who paid for the outside membership! Freaking douche!
  • 2 0
 Or just chips that make me SUPER nervous after watching that huck-to-flat video…

I resisted carbon cranks for long time, but recently had a chance to pick some up for under $275 and decided to give it a go.

So far, zero issues in 6 months of riding and racing enduro. They are very light- but already suffered a few rock strikes that have chipped the finish. I can’t help but wonder how long they’ll really last, and don’t think I’ll be buying carbon again once they are retired.

On the flip side, I have run the same race face turbine cranks on my SS since 2015.
  • 10 125
flag andeh23 (Sep 27, 2021 at 17:42) (Below Threshold)
 @JakeEPooh: I hope they don't find out about my Beta MTB subscription too! I might be double downvoted!
  • 7 0
 @basic-ti-hardtail: Turbine cranks are hard to beat.
  • 1 0
 @notthatfast: and they won’t warranty, buyer beware!!!
  • 1 0
 I put a mean chip in a carbon Descendant crank from a rock strike. Couple layers deep, some splintering. Stopped using them before any catastrophic failure. Been on aluminum since.
  • 1 1
 @TheR: yeah, the only weight difference between NX and GX is the lighter aluminum chainring vs the steel one on NX.
  • 2 0
 I've had great luck with my e13 carbon cranks... bash them to shit and light as fook!
  • 1 0
 @Darwin66: Yup I broke a set too. NEXT cranks - tore a pedal insert out of the arm on a blue trail. Sold the warranty replacement and got a set of XTs
  • 2 0
 @whambat: I replaced the NX cranks with Truvativ Descendant carbon cranks. You can barely feel the weight difference. I’m not sure the weight is worth the difference in price. I use an after market chain ring anyway, so that’s not an issue. I guess what I’m saying is, if/when I break the Descendants, I don’t think I’m ever going to bother with another set of carbon cranks.
  • 1 2
 Nope@plume:
  • 1 0
 @notthatfast: That's not surprising. I'd steer clear of easton and raceface for that reason not to mention FSA and E-Thirteen.
  • 17 0
 I was the initial comment to say, "Begone outsider", they deleted my comment. Not sure how to feel about this censorship.
  • 1 0
 The only carbon cranks I had were FSA ones back in 1999/2000. The aluminium insert to screw the pedal were moving, they refused to take them under warranty. I should have kept them, as epoxy to the rescue might have fixed the problem.

Never again.
  • 1 0
 That's the descendant cranks getting thrashed and still lasting 3 years, been really impressed with them
  • 4 0
 @bishopsmike:
Same. Run XCX on my race bike, TRS carbon on my enduro. No issues.

Actually I have never had issues with any crank. I have run RF Next, Sram X1, X01, XX1, Descendent carbon cranks and no issues what so ever.

Maybe y’all should try to I don’t know, not break stuff?
  • 1 0
 yep this
  • 1 0
 I had same issue got warranty than sold cranks asap - turbine cranks are great no need for fancy carbon crap @andeh23:
  • 3 0
 @Jaib06: A bad sign of things to come?
  • 4 0
 @yourrealdad: As I wrote in another comment that got buried, they need another option on this poll: “I’ve never broken a crank in my life, but I have to front like I’m hardcore.”

I kid, and I know stuff happens, but sometimes I wonder what people do to their bikes. Maybe it’s because so many people are on this site, the one percent that comments when things go bad make it seem like there’s a huge problem. Or maybe I’m just a really smooth rider, or take care of my stuff better. Or maybe I don’t ride hard enough. But by and large, my stuff holds up and works properly. And when it doesn’t, it’s usually my fault — some dumb thing I did, not some inherent flaw in the bike or part.
  • 2 0
 3 crank arms, twice the insert pulled out, once a clean break half way down the arm. RF Next. I'll never have carbon cranks on my mountain bike again.
  • 2 0
 @Caddz: I had problem with rf next but to their defense it's a xc rated crank and I was using it beyond its capacity and I think that's the problem people are having. Now on e13 lg1r and sp far so good after 2 heavy bike park use.
  • 1 0
 RaceFace Next SL cranks are the only carbon cranks I've ever had issues with (pedal spindle thread). Returned two, sold the third set and replaced with Praxis.
  • 1 0
 I've ripped the threads/insert in both carbon and aliminum,and broken-broken ali cranks in the skate park but not crazy/rich enough to even consider riding carbon cranks for street/dj
so "the evidence is inconclusive"
  • 1 0
 @TheR: I had RF carbon cranks for 4+ years and they were great, then a pedal insert pulled out. Replaced them with RF aliminum and they've replaced the dinky metal tensioner ring with plastic! Probably saves 13 cents on otherwise great cranks; such a disappointment
  • 1 0
 @plyawn: Four years isn’t too bad for a life of a part. If I get 4 years from mine, I will be happy. But then, I had some XT cranks that lasted 8+ years before I sold the bike, and as far as I know, they’re still going strong.
  • 1 0
 @TheR: What if the failure after 4 years causes you serious injury because you are landing a big drop and your crank arm snaps? Then was 4 years that much of a bargain? That logic would work for a derailleur, not a crankset.
  • 1 0
 @Caddz: Yeah, I hear you. I was going to add, “As long as I’m able to detect signs f that failure before it becomes catastrophic.” But that goes for any part — handlebars, axles, rims, and so on.
  • 1 0
 @makripper: I've had mine for a year now. No issues...yet.
  • 1 0
 Next SL pedal thread rip out. Raceface was great with warrantee been running trouble free 4 seasons.
  • 2 0
 @igxqrrl: not trying to jab at you specifically, but a lot of people do put pedals on way too tight. With carbon cranks, I could see people going too tight (or swapping pedals all the time at the higher than necessary torque or no grease) and shortening the life of the insert
  • 2 0
 @makripper: Likewise, 3500 miles on my descendants. Jinxed it now!
  • 1 0
 I feel that there should be a poll option for “ have you broken two sets of carbon cranks in 24 hrs…….”

Yes, yes I have!
  • 6 30
flag JakeEPooh (Sep 28, 2021 at 19:26) (Below Threshold)
 All posts by soulless douchebags with the outdoor+ mark of shame shall be downvoted in perpetuity!!
  • 2 0
 @JakeEPooh:
The PB comments section is almost as bad as YouTube comments, and that’s saying something
  • 1 1
 Agree completely. I ran sixc cranks on two bikes without incident but then an E13 carbon crankset failed, not because the carbon broke but because of spindle issues. E13 refused to even inspect the cranks because they said it was 'wear and tear' .....after only a year of use. Poor customer service for a high value item but then when you sell overpriced junk that is made of cheese (ahem E13 cassettes and chainguides) then I guess what do you expect. Swapped out to XT and have had no issues since.

Heres the main question though. If you voted for breaking carbon cranks 4 times or more, should you not think about something else?
  • 1 0
 @notthatfast: so did my aluminum race face cranks
  • 2 0
 @TheR:
Kinda feel the same thing. I know I ride harder than most, but not as hard as some. I take decent lines, again not the best nor the worst.
I am pretty light at 75kg, but that ain't weight weenie land. But all of my cranks get bashed. My metal ones are nice and silver at the ends not matter what and I have to replace the boots on the carbon ones every now and then.

I have heard quite a few people having issues with the RF Next inserts coming unbonded, but to me that isn't a rider breaking a carbon crank either. I have heard of very few instances of people actually breaking a carbon crank and if so poor line choice eh?
  • 1 0
 just stop buying Race Face.....aaaaaaaand maybe Praxis. lol
  • 1 0
 100% this. I’ve “broken two carbon crank arms… but not snapped. Instead the pedal connection has let loose - and another the bottom bracket connection - same thing.
Both race face - wouldn’t ever run again by choice
  • 1 0
 @yourrealdad: Sounds like we have a similar profile, from weight to riding style. I’m not overly tough on my bikes, but I’m not easy on them, either. They get ridden. I’ve seen enough in my life to know that some people don’t take care of their things, or abuse their things, whether it’s their bikes or whatever. Sometimes I wonder if that factors into any of this.

That said, seems like Race Face has a particular issue with the spot where the pedals thread in. Another issue with race face — proprietary standard for chain rings. I know the rest of the manufacturers have their proprietary standards, but a lot easier to find SRAM or Shimano.
  • 1 0
 @TheR: Agree with what you said, although never had issue finding parts. Cinch is the best system out there though for playing nice with all the stupid "standards"
  • 103 1
 I just broke one but I drove my car over my bike so I guess it doesn't count
  • 12 0
 The horror. I'm going to have nightmares about that story.
  • 78 0
 it might count. gunna need you to get a new bike with aluminum cranks and drive over that one too
  • 25 1
 Tell the shop "I was just riding along"...but don't say what you were riding.
  • 1 0
 Oof. Just did that to my front wheel I forgot next to the car on the parking lot. Can't imagine on the whole bike...
  • 85 4
 XT cranks for life. light strong cheap
  • 41 6
 Just put loctite on the pinch bolts so your crank arm doesn't fall off in the middle of a jump line.
  • 11 1
 they fell off on me twice 3 years ago, bought a torque wrench and replaced the preload cap with an AL one. no issues since
  • 12 0
 @skivt27: never had a problem till 12 speed. Shimano quality seems to have slipped.

I ran a 9s SLX crank for 10 years in various bikes, sold it on the last bike, and it's still going.
  • 4 0
 Recently broke the axle of my XT crank. It was maybe 2 months old.
  • 1 0
 XT cranks bend easily, but luckily individual arms are usually available (or at least used to be).
  • 4 0
 @jeremy3220: Had the same issue with Saint and Zee on multiple bikes, not that often but enough that I started to carry spare preload caps for long rides.. Raceface fixed that problem though
  • 4 1
 @skivt27: Really shouldn't have to rely on a preload component though.
  • 25 0
 Saint cranks: buy once.
  • 4 0
 @abueno: ditto Zee
  • 1 0
 @abueno: youve ruined it, some1 from shimano will see this and decrease manufacturing quality now so we have to spend more money for the next set. i put saint cranks on everything, ill take the weight penalty all day long.
  • 12 25
flag ryetoast (Sep 27, 2021 at 13:47) (Below Threshold)
 @jeremy3220: I hate Shimano cranks with a fiery passion. Those cheapo plastic preload caps and retainer clips always seem to either strip out or come loose. Haven't had a crank develop a wiggle, let alone fall off mid-ride, since I switched to SRAM and Raceface.
  • 13 1
 @ryetoast: someone doesn't know that 1.5 Nm is not very tight. I have Zee's since 4 years and not even onces had they come loose. I always mounted them with a torque wrench.
  • 1 0
 bent some XT cranks around 2013. The forged and CNC'd Turbine crankset after that took more and harder impacts without issues. But the preload ring and RR bearings are terrible and I can't see a reason for 30mm spindles... at least I don't use BB92
  • 1 0
 @pablo-b: Concurred that some of my issues were probably user error, but every other crank mounting system seems to be impossible to f*ck up.
  • 1 0
 @abueno: yep. Mine have been faultless for nearly a decade.
  • 6 3
 @ryetoast: is it even a Shimano product if it doesn’t come with a pointless unnecessary proprietary tool that ruins the product?
  • 9 1
 @jeremy3220: Most cranks from RaceFace or SRAM also have preload, FYI. Just implemented differently. IMHO, Shimano's implementation is actually better.
  • 1 1
 @jzPV: Yeah, the Turbine BB bearings don't last very long in my experience, but at least you can knock them out of the shell with a screwdriver and knock in new ones for real cheap. Comparing my Turbine cranks with the 30mm Al spindle and Aeffect cranks with 24mm steel, the Turbines are noticeably lighter, so presumably they needed the larger diameter to keep the same stiffness. I am annoyed by the Cinch chainring retaining thingy, though - SRAM three bolt system is way easier to deal with.
  • 1 0
 @jzPV: Turbine cranks are great.

The preload ring has always worked fine for me, it only needs to be finger tight. It is cheap though, and if it bothers you, you can change it out with a Cane Creek preload ring.
  • 2 0
 @ryetoast: sounds like 6-bolt vs center lock discussion Wink
  • 3 0
 @privateer-wheels: Of course but you shouldn't be relying on a preload bolt to keep the cranks from falling off.
  • 3 0
 @jeremy3220: Shimano doesn't reply on a preload bolt to keep the cranks from falling off, at all. They rely on two opposing pinch bolts. Exactly like your stem.
  • 1 0
 @privateer-wheels: look back through the comment chain
  • 2 0
 @skivt27: the preload cap doesn't do anything to keep the cranks on. Sounds like a pinch bolt torque problem
  • 6 2
 @jeremy3220: if people have an issue with their crank arms falling off, they were likely not properly installed to begin with. Loctite and proper torque. Problem solved, just as you mentioned earlier.
  • 4 0
 @privateer-wheels: Shimano instructions do not say to use loctite. So proper installation may not cut it.
  • 3 0
 @ryetoast: you're not supposed to tighten the plastic cap very much dude!
  • 1 1
 Not for me. Landed a drop and had both pedals down at 6 o’clock. Spline interface just sheared right off all the way around. Cranks were properly torqued. Not a good big guy option - sram GX is a way beefier interface.
  • 1 0
 @Blownoutrides: had the same issue with a ZEE, however the bolts were NOT tightened properly. After getting the crankarm off with a hammer and a big flat screw driver I remounted it proeprly and had no issues since (even with a damaged spline interface). What I want to say towards your case: bad luck or not properly tightened, sorry.
  • 1 0
 @brass-munky: ryetoast said chainring retention. Not preload.
  • 2 2
 @glennyeltee: Shimano cranks won’t last forever. They’re not difficult to install it’s just over time the interface wears and you’ll get play or the crank loosening over time no matter how tight you fasten up the bolts. If you spend £125 on some cheap XT cranks you can’t expect them to last forever.
  • 1 0
 @brass-munky: Hard to tighten it at all without the proprietary tool. Maybe that's why they did that. LOL
  • 3 0
 @ryetoast: I tighten it with my finger, but here's some nice tools:
- Knife
- Flat head screwdriver
- Coin
- Anything flat that fits
  • 5 0
 @Muckal: Or I can use sram cranks and remove/install them by tightening or loosening a single bolt with an 8mm hex key. All else being equal, I'm not sure why I'd choose the cranks that require a pinch bolt, a weird plastic pin, and setting the preload with some random object every time you install them.
  • 2 0
 @ryetoast: i also like the SRAM GXP interface, even if I need to check the bold from time to time.
For me 'every time you install them' is once a year or after the bearings (Hope stainless) go bad. The installation process is no rocket sciene, really. Anyway, to each their own.
  • 1 0
 @ryetoast: in order to do that you have to use a harder more expensive grade of aluminium which costs more money. Shimano uses relatively cheap soft aluminium so it requires pinch bolts to squash the crank arm around the axel otherwise the steel axel will drill it’s way through the crank and your crank would start wobbling and coming lose.
  • 1 0
 @jeremy3220: @jeremy3220: Shimano cranks come with medium strength thread-locking compound on the bolts. Shimano also doesn't tell me to use 3 ply toilet paper, but I treat myself.
  • 1 0
 @privateer-wheels: Proper bottom bracket/shaft spacing is key for these cranks. I was chasing loose cranks until I sorted that out.
  • 1 0
 @Glenngineer: The 12s cranks use a narrower spline engagement area than before, so tightening them properly is more critical.
  • 40 1
 I can’t afford carbon cranks lol
  • 37 1
 "Yes, I've broken four or more carbon cranks." Poor bastards
"Nope, I've only owned carbon cranks. " Rich bastards
"Yes, I've broken four or more aluminum crank arms." Poor bastards.
  • 86 2
 last one should be "fat bastards"
  • 6 0
 There should have been a caveat that you've broken aluminium cranks in the last 5 - 10 years. Tapered aluminium cranks back in the 90's used to break after 4 pedal strokes, so I've lost count of how many I broke back then.
  • 2 0
 @bigtim: FSA Sidewinders.
  • 1 0
 @bigtim: good point on timing. I broke and bent a collection of Alu race face and Shimano cranks in the early 2000’s. current race face turbines have been fine though I don’t ride as hard as I used to and the suspension travel on the bikes now probably helps with forces as well
  • 1 0
 @bigtim: agreed ... plus in the 90's those cool cnc anodised cranks we all wanted where crap. Thats when my failures occured. It also makes me scared of carbon cranks, those 90's cranks breaking keeps me away, I still have the scar on my ankle.
  • 32 1
 What is this peasants poll, where is the : "Nope. I run only titanium cranks without trouble cause I buy new ones each year"

/s
  • 34 3
 Broken an alloy crank, or "rounded out the spindle hole and had to replace it"? Plenty of those!
  • 4 1
 Definitely needs to be an option.
  • 8 0
 when I was just getting into biking, I screwed the wrong pedals into the wrong cranks and ruined them both. never made that mistake again..
  • 18 0
 @danielfloyd: My uncle did the same thing. It's takes some commitment to ruin both!
  • 6 0
 @MisterChow: I had no idea what I was doing, and I didn't know there shouldn't be that much resistance. In my mind I was thinking "this must mean they won't unscrew themselves.." little did I know... hahaha
  • 20 3
 One time I pedalled so hard overtaking a roadie in full lycra,uphill,while I was wearing boardshorts and sandals that I melted my carbon cranks. M.Wragg
  • 10 1
 This one time, at bike camp...
  • 11 0
 Has anyone ever broken eeWings titanium cranks? If I'd even care to save weight in this low and central place on my bike, I think I'd rather safely go for titanium rather than for carbon. That said, I don't quite see the point of saving weight there. BMX racers spinning 180rpm yes, but on a mountainbike?
  • 6 2
 I saw a pair in the wild the other day. Rider took off at warp speed down some gnarly shit, so I didn't get a chance to ask about em - which I guess is a good sign. They look great, they're light, AND they come in 165mm unlike any carbon MTB crank AFAIK, so I would totally buy a set if they weren't worth more than my entire bike.
  • 3 1
 @ryetoast:
I'll never spend that much on a crank, it's just conspicuous consumption as far as I'm concerned. But if they did a steel version... I'd pay a premium for what would almost certainly be heavier and really no better than good old SLX/XT, but they'd be the ultimate bling for a hard charging steel bike build.
  • 1 0
 I have a set I got a very good deal on that I'm looking forward to running more, but the value proposition is still pretty rough even at a good price. I have three sets of Sixc in use all bought in total under the cost of the wings, none of which I can seem to break used from dj to dh... coming from someone who's bent, broken, and snapped half a dozen or more alloy and steel cranks (with the pics to prove it)
  • 5 0
 I beat my eeWings to death on a titanium hardtail, rock strikes, fast tech. Great cranks.
  • 9 0
 @HaggeredShins: Name checks out.
  • 1 11
flag nickfranko (Sep 27, 2021 at 15:58) (Below Threshold)
 Titanium suffers the same problem as carbon fiber: it's hard and strong as a material, but when it fails it fails hard. They will break, not bend.
  • 7 0
 @Glenngineer: back in the 90s when hucking your Super 8 off of buildings was popular, we all ran Profile 3 piece cranks which are still available on their website.
  • 2 0
 If you think eeWings are expensive you justify them by how many carbon cranks they will outlive. In my area we see carbon cranks fail regularly, at least a set per season. I can bash my eeWings through rocks that render carbon cranks useless. They're tough as nails and you can refinish them too. I plan on having these for at least my next 3 bikes after this one where I have put two seasons on them. Good investment grade part you keep for the long haul, not a plastic crank with a shelf life.
  • 4 0
 @ryetoast: Cane Creek had a "mystery box" deal where $500 would get you a deal on some mystery object. Turned out to be eeWings cranks. You had to commit before knowing what the item was, which is super sketchy, but turned out to be a winner for the folks that took that chance!
  • 2 0
 I know one person who has broken a set of EEWings. They were a few months old. Judging by the reaction of the guys at Cane Creek (and the lack of other broken ones), I believe it was truly a manufacturing defect.
He sold me the replacement set, which I'm happily riding.
  • 1 0
 @ryetoast: SRAM X01 DH, Truvativ Descendant Carbon, Raceface SixC, and E*13 LG1R cranks all are available in 165mm. Yes, they’re designed for DH, but you could run them on pretty much any type of mountain bike without any issue. May need to change your BB or chainring, but they’d work.
  • 12 4
 Running carbon Stylo cranks on my current bike. Forgot to secure the rear wheel on my rack driving home from Squamish one time and hit a speedbump in New West dropping my buddy off, and the rear of the bike bounced out and the bike landed right on the crank on the rack. Some scuffs but it's still going strong a year later.

I'd only buy SRAM carbon cranks but it's not like you're spoiled for choice anyway. You couldn't pay me to run any e*13 gear, Rotor is poorly distributed in NA, RaceFace is more money for no good reason, and obviously I'm ascaired of Praxis at this point.
  • 4 0
 Raceface has "the more you the the more it cracks" situation
  • 2 2
 agree. e13 is garbage.
  • 1 0
 @blackercanyons: never had a problem in 2 years of heavy use at bike park on my lgr1
  • 2 0
 well is said the twice, it ment to be the more you pay
  • 3 0
 @Noeserd: try again
  • 1 0
 @ybsurf: lol new phones keyboaerd is hard
  • 1 0
 @Noeserd: I know, I'm the same Wink
  • 10 0
 I’ve been wailing on my XO1 Eagle carbon cranks since they came out, and while they’re scratched to hell, they’re still hanging in there.
  • 11 9
 Until they snap catastrophically and then they'll be the worst cranks you've ever owned....will never buy carbon again! Etc.
  • 2 3
 @MattP76: I’ve never heard of X01 Eagle cranks breaking. The XX1s definitely break semi-often though.
  • 3 0
 @MegaStoke: the Eagle cranks (the ones after DUB was introduced) definitely break, but not nearly as often as the older models. -So SRAM has made improvements.
  • 7 0
 I didn’t break an aluminum crank arm, but the threads stripped out on the drive side pedal on a Race Face Aefect crankset. I consider that broken since I had to carry the pedal in my pocket and Fred flinstone myself down the rest of the trail.
  • 6 1
 I'm really curious to see how many cranks people are breaking. Of both materials.

IMO, the main thing for "most" casual mountain bikers, is that the cost/benefit ratio for Carbon cranks is just not there.

To be fair, the main pro is the amount of weight saved (~100-200g iirc). And that is absolutely noticable, and a pretty large amount for a single component, so I get why people use them.

But in the cons list we have the stigma of "maybe it will break", and that, especially when it is more expensive can definitely give people pause. Plus, the weight is so far down on the bike, I'm not sure how much impact it would have to the average joe/anyone not racing/chasing uphill KOM's.

I think we all know that everything can break (AL, Carbon, TI, whatever). But why pay more for something that has somewhat questionable benefits, and may decrease reliability, and cause injury?
  • 1 0
 What about stiffness?
  • 10 0
 @carlchristian: there’s prescription meds available to improve stiffness
  • 5 0
 I've been riding DH for 15 years now, with plenty of hucks and never broken a crank, though Turbine is the lightest I've run. I have however, broken basically every other part on a bike, so guess I'm gonna try carbon cranks now to complete my trophy room.
  • 1 1
 have you broken a frame? I hope if you have it's a spectacular failure like the headtube snapping off
  • 2 0
 @imnotdanny: haha, fortunately no head-tube full snaps resulting in a crash, but 1 bottom tube about half-way through on one of the old thin Treks that everyone was breaking around 2010, and recently the rear chainstay on a Capra.

Never broken a frame on a DH bike though... IH Sunday, Giant Glory, Transition TR-series, Santa Cruz V10, those were made to be abused.
  • 4 0
 Need an option for: "Replaced carbon crank due to damage from rock strikes". This is my thing with them, is that while they're great, I have to care about hitting them on rocks, while I don't mind smacking rocks with my polished old Shimano or raceface alloy cranks.

Sudden catastrophic failure seems unlikely for either.
  • 7 0
 What about steel bmx cranks? Broke the bolt clean in half. Extracted with drill. Never felt more manly.
  • 3 0
 Disappointed I had to scroll down this far to find a mention of steel cranks. I still want steel tubular cranks on my mtb, but have never had issues with them on my BMX and MUni. Seems like titanium cranks (eeeWings) currently are more common than steel on mountainbikes (yet no mention of titanium cranks either).
  • 2 0
 this!
  • 1 0
 Flight or Red Line cranks come to mind ... used a spline and pinch bolt to secure to BB axle. That was heaven-sent compared with the tapered setup that chronically came loose (should have told us to use Loctite lol).
  • 1 0
 I broke one, failed at the welded area... and could only bend aluminum ones.
  • 1 0
 @vinay: Thunderbolts, the pinnacle of bmx cranks, made literally to jump off buildings, weight 800g (like saints) and cost £160...

How do you you fit a mtb chainring there, though?
  • 2 0
 www.profileracing.com/product/column-22mm-crankset. Heavy and expensive, but goes to 160mm. Lifetime warranty on all-steel version
  • 4 0
 Made some math and it is 25% failure for carbon AND aluminium. It sounds like an awful lot but hey it's a pinkbike poll not science
If we only consider broken and not bent, it drops to a 12% failure rate for aluminium.
I guess depending if you are valuing safety, weight-saving or price, you can make your own choice.
  • 3 0
 Not sure how you calculated but I get 39% broken carbon, 21% broken aluminum (didn’t care about bent). I’m guessing you just added each result without multiplying by the 2,3,4 numbers, or earlier poll numbers were lower
  • 5 1
 I know 3 people that have broken eThirteen Carbon Cranks. I emailed them with my concerns and pictures of my cranks. They said they were not safe to ride and that I needed to replace them. They went on to tell me that Carbon is not a good crank if you have rocks on your trails. Huh? These cranks came on a full dentist-built Santa Cruz what the hell did they think I was doing with it?
  • 2 0
 I have a set of gen 1 LG1R dh cranks that cracked after 5 seasons of dh bike park, considering what it has gone through, I guess that's reasonable. Now I run the e13 aluminum dh cranks that are a whopping 77g heavier. Downhill carbon cranks should not exist.
  • 2 0
 @aln1230: mine are not cracked but eThirteen still said they are not safe to ride. Given the guys I know who have broken their cranks catastrophically I'd not ride eThirteeen or likely anyone carbon cranks now. Just not worth the risk.
  • 4 1
 Broke 4 sets of SixC in a single season. 5 or 6 sets total. Been running atlas for two seasons (same set) and they have been flawless. Too many load variables to properly make a DH rated carbon crank. I prefer the stiffness of a carbon crank, but the weight penalty of roughly 100g for a set of alloy is a non issue for me.
  • 24 2
 Can I ask a serious question? Why did you keep warrantying/replacing the SixC cranks?

"Fool me once, shame on you. Fool me 5-6 times, and 4 times in one season..." Smile
  • 5 0
 Had a wall in the shop we hung broken stuff, It was mostly raceface bars and cranks . . . . . . .
  • 1 0
 I had Atlas cranks on a DH bike that saw regular weekend use for like 5 years without a problem. Had another set on 3 different bikes since 2013 and they're still there on that last bike going strong. Set and forget.
  • 9 0
 @KJP1230: Because it was free, and that was their policy. Eventually RF offered up atlas and some other goods to offset the cost differance. Only a fool would spend money on the same thing twice.
  • 3 2
 @KJP1230: Would you rather get free cranks or pay for cranks? Especially because the latter doesn't guarantee being break-free.
  • 2 0
 @nickfranko: Decent aluminum cranks can be had for $120.00. "Free" cranks at the probable expense of a shattered ankle or catastrophic injury is a price I'd never want to pay.

I have a friend who had a pretty horrific ankle injury from a single carbon crank arm failure. I cannot fathom risking serious injury by replacing a crankset that had failed once or twice - let alone 6 times. The fact that this guy broke a crank 6 times and didn't blow himself up repeatedly in the process is frankly unbelievable.
  • 2 0
 @jomacba: How did you manage to break a crankset 6 times and not get seriously injured in the process? I think you've used most of your nine lives, man!
  • 3 0
 @KJP1230: To be fair, only one set actually broke in two pieces. The other ones cracked but didn't completely fail. You are correct in using my 9 lives. It got to a point where I felt like I was pushing my luck, and when RF offered up the alloy cranks I took them.
  • 1 0
 @jomacba:
Good thing they've got you covered.
RF refused to warranty my fourth NextR which lasted whole two months and delaminated as all the others before as their warranty is limited to 24 months after the initial purchase. Never buying one of their products again
  • 1 0
 @lettucelover: Thats unfortunate for sure. I have had good experiance dealing with RF warranty all around. I do believe their carbon cranks leave much to be desired, and I'm not the only one locally that has had some issues with them. However, I can speak to their alloy parts. I have had zero issues with any one of their parts. I run the atlas bars as well. While I prefer the feel of their SixC bars, the peace of mind with the alloy bars is something that's important to me. RF went through a bit of a transition in staff when they were acquired by Fox. I can honestly say, they have made leaps and strides in their customer service in the past 10 months, and I run their products because of this. I highly doubt there is a carbon crank I could run that wouldn't fail. Sorry to hear you've had such a poor experiance.
  • 4 1
 Cranks have got to be the dumbest thing to make out of carbon given the number of hard parts that need to be molded in plus how much scratch-dent damage they receive. Plus they're crazy expensive and only marginally lighter than the best aluminum cranks. They're not even that stiff.
  • 9 7
 I contend that frames are the dumbest part to make out of carbon, due to the exact same reasons you gave about cranks.
  • 2 2
 @freeridejerk888: given the reasons the OP gave. Frames would be much worse, lots more molded in hard parts in a frame than a crank, frames receive scratch and impact damage, they are very expensive and only marginally light than the best aluminum frames.

I also contend that since every company making frames needs to make 3 or more molds for every model of carbon frame they make that this is another thing that makes carbon frames silly. Having owned many steel, several alloy and several carbon frames, I would pick steel or alloy over carbon everytime. It is a lot easier to train someone to make a carbon frame though over welded, so the industry will keep mostly making high-end carbon frames instead of making aluminum a more common choice for high-end bikes.
  • 3 0
 @insertfunusername: my favourite part of owning an aluminum bike is not having to baby it at all. Scratches and scuffs? No problem. Drop it on rocks? Pfft. The toughness alone is worth it.
  • 4 1
 Always make me chuckle when I see people commenting. "I've broken aluminum and steel cranks but never a carbon one!" Firstly, over time products and quality improve greatly so your aluminum cranks you had in 1996 are not the same as in 2021! Also when your carbon crank does snap without warning it will all of a sudden be." I'll never buy carbon cranks again! "

Just remember this. Raceface Atlas aluminum cranks had a lifetime warranty. When RaceFace launched their SixC cranks which they claimed was stronger, lighter, better, faster they only warranted them for 3 years!! You can give all the excuses on this planet but that literally says it all about carbon!
  • 6 1
 100kg rider watches 60kg rider snap carbon XO cranks.... never will i buy OXs
  • 3 1
 That ankle vid got to me as well, 130kg's here and no complaints on aluminum cranks!
  • 2 0
 I was riding Pinhoti 3 at a pretty good pace and got a little too close to the bank and a root grabbed my pedal. Didn't break the Next carbon crank but did booger up the threads so the pedal wouldn't screw in proper level. Was able to get a crash replacement but I had to cut the crank in half, they're not that thick... Neither me nor the guy behind me know how the heck I stayed upright!
  • 1 0
 Going south on Pinhoti 3, there’s a sick turn with a high line about 5 feet above the main trail. Took it blind. Turns out that high line ends with a drop back to the trail. Was not prepared.
  • 1 0
 Is Pinhoti worth the drive? I frequent Blankets Creek so it would be a haul to get there.
  • 2 0
 @Blackhat: LOL, I know that one! You're running along fine on an alternate line and bam! gotta huck it!
  • 2 0
 @AFunFox: absolutely worth it! I also like P3&4, some techy switchbacks on P3 and I like to do it as an out and back. Definitely do it proper and stay at Mulberry Gap, love that place and the people there are top notch plus they serve awesome homecooked meals
  • 1 0
 @AFunFox: Definitely. It’s not Pisgah or anything, but there are a lot of fun, reasonably challenging sections. I’m from near Knoxville and absolutely plan to go back.
  • 2 0
 2021 and with all that R n D we have this?
Oh I run Saint cranks. No issues.
I see the same 104 bcd Saint cranks on DH pros bikes . Does Shimano still make same Saint cranks ? Same model ? When something works perfectly why mess with perfection.
I want to believe in carbon fiber I honestly do. I think you can get very stiff and very light carbon fiber cranks but reliable strength. Nope.
If someone made a addatives manufacturing titanium exoskeleton with a carbon fiber webbing. The cranks would be awesome and cost significantly more than my bike.
  • 2 0
 Heavy? Yes.
But damned if (second gen) Saint cranks haven’t simply held up to anything and everything for me and many many many great friends and riding buds over the years. From long days, to huge hucks to the nastiest race/ rock features.

I love the way they look and wear off.
THEY WEAR oFF - that’s how long they last!
  • 1 0
 Owned and never broken carbon including 3+ years X01 on a hardtail, 1+ of “those e13 cranks” and now on some new Eagle X01 for the last several months.

Managed to destroy a set of RF Chester alloy cranks in a bad crash, which was fine as it was better than killing the Operator they were attached too.
  • 1 0
 For me the carbon was strong enough, but the bond between aluminium and carbon wasn't - I think maybe weakened due to corrosion, but that's a guess. And that counts as broken as they don't work after that. First one failed being treated normally, warranty replacement failed being looked after carefully on XC duties with no noticeable impact causing failure. There won't be a third time...
  • 2 1
 I weigh 250 lbs plus gear and beer. So no carbon anything for me.
I did once borrow a friends bike for a while and I had carbon wheels.
I didn’t know it had carbon wheels until I gave it back. I just never noticed them. I have broken one pice steel cranks on my BMX when I was younger. And I’ve bent many of the square taper BB’s over the years and an octolink too.
  • 1 0
 We need to have some further context such as age of crankset, etc. And, even the rider's weight as well. I've only ever had one crankset go bad and it was an XT m760 that I'd had for a decade and the threads simply got bad with too many pedal swaps...
  • 1 0
 Never broken a carbon crank, but only been riding one for ~10months and 1,600km. But riding alum cranks for >40yrs on various bikes. So that skews my data a bit.

My Optic C2 came with carbon cranks, but I would never buy them otherwise. Alum is a far better material in this application.
  • 1 0
 Broke 2 RaceFace 6six crank arms in the same place...the metal pedal insert torqued the end braking the carbon fiber. RaceFace wouldnt replace the one because I didnt have a reciept of purchase, eventhough it was an obvious design failure.
  • 1 0
 After breaking 2 sets of xx1 eagle cranks and having them warrantied, sold the new set and installed nx cranks. They are still going strong after 2 years. One of the xx1s failed on a big compression, I was lucky to walk away with only a bruise. Not worth the risk IMO. Let it be known I weigh 90kg.
  • 1 0
 I had SRAM carbon cranks on my 5010 - ran them without issue for 4 or 5 years. only pair I have had in Carbon.

I have bent an alloy crank on an ebike (dropped bike onto a rock sideways from about 10 feet, crank took the sideways hit). No crank would have survived I suspect.
  • 1 0
 Should have had another option.. would you consider buying carbon Cranks... i used to have all my bikes with everything possible as carbon. I've gone the past opposite these days... i just want something tough that works and i don't need to worry about.. not so concerned about the weight.
  • 1 0
 I'd like to point out that shearing/cracking/snapping wasn't the issue with the carbon cranks I have broken.

Raceface Nexts have a bad tendency to develop play as the bonding between carbon arms and aluminum threaded inserts come loose...
  • 1 0
 Yep. 165 SixC with pedal still attached to bottom of crank arm. In fairness, completely my fault catching a rock full tilt. Had 5 runs that day and rode things out without crashing, so not too bad a day. Makes for a cool story and souvenir hanging in the bike cave now. Still running the replacements successfully 2 years later without issue after getting a great discount on the replacement arm having been honest about the situation that caused the failure. Thanks RF!
  • 1 0
 I had one bike with carbon cranks and they worked fine but it worried me when they would clip rocks and chip off the surface layer. I got some rubber boots for them and didn't worry after that.

That being said, on my new personal dream build enduro bike I use alloy cranks, and alloy everything (alloy spire). Weighs 37.5 pounds and climbs fine.

Also, I have seen a lot of Shimano road cranks break (online, not in person) and those are not carbon fiber.
  • 1 0
 I wonder if pedal spindle length/rider weight combo might be a factor with some of these crank failures. I’ve also wondered about clipless possibly helping cranks twist; the only cranks I bent (badly) was RF turbines with spd’s when my foot twisted upon landing. Haven’t twisted any with flats in the last 20 yrs.
  • 1 0
 Maybe the real question is “have your carbon cranks even catastrophically failed vs have you ever bent your alu cranks”? In my experience though, replacing aluminum cranks has been commonplace but some of that comes down to old square taper issues and other times threads ripping out. Based on the comments, I think I’ve been lucky with the carbon stuff
  • 1 0
 I’ve never had carbon cranks.

But, the first real MTB race I ever entered was a cross-country race in Georgia sometime around 2000. Literally the first thing I saw as I headed to the registration area after getting to the race venue was a guy from the race before mine standing around with a sad face holding a broken carbon crank in his hand.
  • 1 0
 It's funny this article should come up today, as earlier on my ride today, I noticed how beat-up the ends of my aluminum crank arms were, from rock strikes - could see real gouge marks and raw aluminum, instead of cool black anodizing......I now understand why they sell those little rubber booties for carbon crank arm ends - it's not for keeping 'em looking nice.
  • 1 0
 I'm not sure the root cause of the failure is the point, I think the more important question is "is it happening on carbon cranks frequently?" Yes. "Is it happening on aluminium cranks regularly?" No.

So regardless of whether it's just straight product failure, or if it's caused by a rock strike or similar, something about the common use conditions of a crank makes carbon unsuitable for use. It's no good saying the crank is perfectly strong enough unless you hit a rock with it, as we all know this is going to happen to your crank routinely.
  • 1 0
 I eventually bust every crank I use. 3 years for the Kookas. 2 years for the Cooks. 4 years for the old Race Face Turbines. 3 years for a M-960 (spindle) Still using a set of M952's on a commuter. 10 years on White Eno's (Two pairs)
3 months on a set of Bontrager Carbons.
  • 1 0
 Original Race Face SixC 24 mm cranks were no trouble for 3 years. Next bike I upgraded to the RF Next SL cranks, a few months later, loose pedal insert. Upgraded to Next R cranks, again a few months later, loose pedal insert. The warranty Next R crank arm, a short time later, loose cinch chainring mount. Asked Race Face to down grade me to the Turbine crank which they did and threw in a SixC handlebar, so good service but poor product. SRAM X1 carbon cranks on my Yeti for almost 2 years now and no issues. X1 Carbon has proven to be a solid choice. Race Face you need to pay attention here.
  • 1 0
 I have three and a half years on e*thirteen carbon cranks, they bear some dents and splinters from direct rock hits but nothing that worries me. Pretty solid cranks. I happen to have made a GX crank arm rotate on its axle, but that was from a bashguard hit that has not been replicated on the e*thirteens with equal force.
  • 1 0
 As awesome as carbon is, it should never be used as a crank. I’ve owned 3 pairs of RF SixC and loved them, never had an issue with them, but in the back of my mind was always the worry about bashing them and having them explode Eek At the time when I bought them I went a bit carbon crazy. Frames, bars, rims, cranks, seat post and seat rails. Looking back now, since I no longer own any of those bikes after using them for 3-4 seasons, the cranks are the biggest waste of money and have the highest risk. I’ll only own aluminum from now on. For the money I save I can use it towards a bike park pass tup
  • 1 0
 My SRAM XO carbon crank snapped at a race, causing me to lose my footing and fire myself over a berm into a tree. I was spineboarded off and taken to hospital with concussion. Contacted SRAM and sent they asked me to the crank for analysis, in California, which I did. SRAM refused to warranty the crank as I had "overloaded the crank beyond it's design parameters." Bear in mind I weigh 65kg and it was fitted to an enduro bike. Sram said the reason for the overloading was that it had (and I quote) "made contact with the floor". I responded that perhaps they should be designing the crank to different design parameters then!
  • 1 0
 I’ve had the same x01 crank on my bike since early 2017. Free ride, bike parks, jump tracks, and drops. Even drops to flat off 5 and 6 stairs. And haven’t had any issues. They are banged up as well and I weigh 190lbs geared up. I don’t think one is stronger then the other.. that being said I have broke an xt crank before.
  • 6 4
 I’m sorry but either stick with turbines or xt or if you really want to go all out get the eew’s. But carbon for a crank material lame.
  • 1 1
 i just want profile bmx cranks on my mtb and never thing about cranks again..

I've been running the set on my bmx for at least 6+ years with zero issues, even jammed a wrong size bolt in the non-drive side 5 years ago since i forgot the correct bolt at home on a trip to Barcelona, still going strong.

My mtb cranks however, they creak when i look at them wrong.
  • 3 0
 Then I have good news for your bike, and bad news for your bank account! www.profileracing.com/product-category/profile-mtb/mtb-cranks
  • 1 0
 @barp: holy moly those are expensive
  • 1 0
 @barp: i know, but nowhere do they say what kind of bb is needed, what kind of chainring fits etc.
  • 1 0
 @waldo-jpg: The matching BB is sold with the Elite Crankset; you choose it on a drop-down menu. Their terminology is maybe a little confusing as they're a BMX company first and foremost, and the BMX world refers to what the rest of the world calls an "English threaded" or "BSA threaded" BB as "Euro". They also offer all the common press-fit BB options. They don't mention BCD of their spider at all, but it's probably 94 mm. I'd just send 'em an email if I were interested in placing an order (or find an LBS that carries them).
  • 1 0
 @barp: ah ok, got it. I'll probably stick with my Raceface turbines until they give out though Smile appreciate the explanation
  • 1 0
 @waldo-jpg: Cheers!
  • 3 0
 There is the poll question for the titanium cranks? Are those eeWings bulletproof?
  • 1 0
 I believe they are. If you want a sub-XTR weight crank that can actually survive a beating, eeWings are for you!
  • 4 0
 I just don't get carbon cranks.
  • 4 1
 A carbon crankset killed my family. I'll never forgive carbon for what it's done.
  • 1 0
 For me its the carbon bars which I have given up on. Most crashes I have had with them damage the bars to the point where they cant be safely run. Deep notches in carbon bars from hitting rocks or twisting brakeclamps.
  • 2 0
 Hitting rocks and scratching your bars is one thing, but if your brake or anything clamps to your bars is so overly tight that it scratches your bars if moved, that is mechanic error.
  • 1 0
 @insertfunusername: Thats interesting, did not realize that. What is the suggest torque setting. I always just tighten them till feels about right
  • 3 0
 @mastakilla: I don't know if there is an actual prescribed torque value. Just barely tight enough to not move around during use is the right amount of tight. That way if it gets moved in a crash you can just move it back into the right position and keep going.
  • 1 0
 I broke a Sram carbon crank arm right off at the axle. I won't be trying carbon cranks again. Asking for broken ankles / legs.

Those who answered they they broke more than one set are stupid or fearless !!
  • 2 0
 I mean, I havent.
But I've seen it happen.
To be fair, any crank wouldn't have enjoyed that experience.

www.pinkbike.com/video/353936
  • 1 0
 Anyone have the Race Face Carbon cranks from the early 2000's. They were awesome when you broke them (and they broke all the time) you could see that the "carbon" was just cool stickers on the outside of the crank.
  • 1 0
 This poll obviously came about from the recent Huck to Flat test on a Kenevo SL w/Praxis Carbon cranks that snapped.

I've seen plenty of AL and carbon cranks break or bend, so stop with the dramatics.
  • 1 0
 I blew up the e-13 carbon cranks that came on my Yt. I’m must say there customer service was top notch. Sent me out a replacement set which I promptly sold. Been running race face atlas cranks and they are holding up well.
  • 1 0
 No issues with carbon cranks. Have snapped some aluminum ones... and pedals. But carbon has been just fine so far. I'm sure one will fail at some point. That's the nature of the sport.
  • 3 0
 Breaks 4th+ carbon crank then goes home and buys another set. That’s literally insane.
  • 3 0
 Warranty replacement(s) and sponsorship(s) come into play at times also.
  • 2 0
 Where's the "bent an alu crank arm and being a cheap ass rider I bent it back and rode it happily untill I got new shiny xo carbon cranks that then snapped" option?
  • 1 0
 Cracked an Xo1 crank at the pedal insertafter 5 years of riding without crank boots. I think it served me well considering that I showed it no mercy with plenty of rock strikes of all sorts
  • 1 0
 I landed one-footed on a decent size jump and snapped a RaceFace Next SL arm in half. It wasn't quite as dramatic as Jason's crankarm failure in the huck to flat test, but it was close.
  • 1 0
 Useless stats unless they're analyzed taking the far bigger number of aluminum cranks in use into account. The percentage failure of Ali is probably miniscule compared to carbon...
  • 3 0
 I have a SixC crankset on my v10. It gives me anxiety
  • 1 1
 I had nextRs for a while on my trail bike. enough horror stories and i have relegated them to the gravel bike where hopefully they will last.
  • 3 0
 Check the area around the pedal inserts regularly. Look for any hairline cracks, and warranty immediately. Rf will likely offer up atlas cranks with some other things to offset the cost. Take it, the atlas cranks are great, and trouble free.
  • 1 0
 I always wanted these back in the day. I’m super happy you can buy them still.
  • 1 0
 I hope to one day have a bike worthy of cranks like that, daaaaamn
  • 1 0
 I've never had issues with carbon. But I did have a Shimano crank delaminate while riding... Not catastrophic but it did ruin the rest of the day.
  • 2 0
 I've got eThirteen carbon cranks on my 2016 Capra and still have zero issues with them. Maybe I'm not trying hard enough?
  • 1 0
 On year 3 with my LG1r cranks. Broke a set of SIXC before that, but the e13 have been great....
  • 1 0
 2016 YT Tues with the LG1R DH cranks cracked two months ago. Run the alloy e13 cranks now, only 77g heavier
  • 2 0
 you four or more people need to move on to the next tougher material. Been a while since I saw profile steel cranks on MTBs.
  • 2 0
 I'm in the 4 category. Eventually treated myself to a pair of Ewings two years ago. Zero regrets.
  • 1 0
 Snapped a X01 crank halfway down super Morzine “run of death” lift line, still beat my mate down after going back up to pickup my Vault pedal Smile
  • 1 0
 I've bent two alloy cranks beyond repair and have ridden DH and raced enduro on a few carbon cranks without any issue so far.
  • 1 0
 I have never out-right broken many components on my bike, yet I see these posts and surveys and being to wonder if I am not trying hard enough?
  • 1 0
 i trashed the spline on a hollowtech crank, but that was on me because i had the wren torque on th bolts. other than that they are perfect in my eyes
  • 2 0
 Jason Lucas, I hope you're all healed up. If not, get well soon, as in 100%.
  • 1 0
 Race Face Ride alloy crank 8 years in use in 3 diferent frames Many chainrings and 1 BB change Arms and spindle in perfect condtion at all
  • 2 0
 I've eventually twisted/bent every set of aluminum cranks I've ever had. So far not one issue with carbon cranks.
  • 1 0
 Many years ago some wise man such as RC or GaryF said Ti bottom bracket or peddle spindles we’re just a risk not worth taking on a MTB. Same with Carbon cranks?
  • 1 0
 I have broken 2 sixc cranks...lbs (who know me well) refused to install new warranty cranks...said buddy get saints...i did no problems
  • 1 0
 Had troubles with my Race Face Next R crank sets, two times loose Insert at the spindle, lost confidence into carbon crank sets an running now XTR without any issues
  • 1 0
 I broke a Profile Racing BMX crankarm once casing the heck out of a pretty bit double. Maybe if I was riding carbon fiber cranks it wouldn’t have happened.
  • 1 0
 ...judging from these comments you would have broken them even more. pretty sure you're trolling the people promoting the profile cranks though.
  • 1 0
 Another hand up for RF Next SL failure at the pedal insert. Warranty replacement no issue with Next R's. All good for 2 years now.
  • 1 0
 Currently running a set of SixC on a my dirt bike which see a lot of skate park action including the occasional crank arm grind ( on a steel topped ledge). No issues as yet
  • 1 0
 Out of the broken aluminum cranks, I'm interested in how many were hollow forged.
  • 2 1
 Back in my heel rubbing days I ran a set of SLX hollow forged cranks for so long that I rubbed right through one side... I'm not sure that really counts as it was 100% my fault.
  • 1 0
 Alloy cranks have been around a lot longer, giving more chances for things to wrong over the years…
  • 2 0
 If only I could run Thunderbolts with a narow-wide chainring...
  • 2 0
 Where is the question about steel cranks? I've broken two sets of those.
  • 1 0
 I'm still rocking RaceFace Prodigy XC with a !S!S interface. Just replace the bottom bracket every few years!
  • 2 2
 There should be a selection for "I have no experience with carbon cranks but I want to hate them anyway".

Like people do to anyone with an Outside+ banner.
  • 1 0
 It all depends on how long you’ve been riding. I’ve broken many square taper cranks. Anyone ever heard of kooka?
  • 1 0
 Oh yeah, the ano blue Kooka cranks were my fav!
  • 1 0
 At time of my answer: 3000 people owned carbon cranks. 1000 people have broken them. 33% Failure rate. Enough said.
  • 1 0
 They need an option for, “I’ve never broken a set of cranks in my life, but I’ve got to front like I’m hardcore.”
  • 1 0
 On the other hand, I view cranks as a touch point, like bars, and I do notice the damping quality
  • 1 0
 That's why you buy your self a real crank from cane creek . Eewing is bullet proof , Facts!
  • 1 0
 Praxis, replaced by distributor without even having a bill after 3 years of using
  • 1 0
 i have a crack in the (steel?) spindle of my XO GXP crankset. looks strange to me, anybody else has experienced this, too?
  • 1 0
 had few carbon cranks- one was broken in the middle, rest were cracking because of design failure...
  • 1 0
 I have a sram x01 for several years, transferred to three different enduro bikes ...
  • 1 0
 Carbon fiber cranks are just stupid unless your roadie or super mellow XC rider. Why waste time and money for a few grams.
  • 2 0
 Where's the square taper BB failure category?.....f&^k I'm old!
  • 1 0
 Fuk RaceFace with their bs carbon cranks and shoddy pedals and handle bars.
  • 1 0
 "Bent multiple aluminium cranks". Cheaper aluminium cranks bend easy, what can I say.
  • 1 0
 This poll jinxed me, hadn’t broken a carbon crank, answer poll no, 5days later snapped my sixc crank arm
  • 5 6
 Where is " I am removing the cranks from my ebike and replacing it with a throttle so who cares about cranks" answer to these poll questions.
  • 3 0
 Lame
  • 2 0
 That ceases to be an ebike. That's an electric motorcycle.
  • 5 0
 @barp: It was an electric motorcycle before. Now it's just missing cranks.
  • 2 2
 @barp: The pedalling just gets in the way of the true spirit of MTBing. Plus think how much they will be able to charge for ebike WNP ( who needed pedalling). It's all the rage for those of us already behind the paywall beta site....The huck to flat " incident" was the last straw for any resistance to the WNP movement.
  • 2 0
 @pink505: dude do yourself a favor and get a real moto, they're super fun and will make you a better rider, but dont lie to yourself thinking its mountain biking.
  • 1 2
 @mariomtblt: I prefer Bro or Bra, I had a vespa but only used that to hang with my roadie friends. They didn't think that was cool so I got an ebike to get new mtb friends and spend my days trolling pb comments.
  • 1 0
 Needs a "too poor to own carbon" option.
  • 2 0
 just about to say this, bud. Ive never owned carbon cranks is code for im poor
  • 1 1
 This is very timely. I saw a pair of Race Face carbon cranks snap at the pedal insert yesterday.
  • 1 0
 I’ve never noticed any benefit of my carbon cranks over metal ones
  • 1 0
 I broke a bb and bent a crank at the same time.
  • 1 0
 Perhaps thermoplastic composite cranks?
  • 1 0
 never killed carbon cranks but i have bent alloy cranks in a crash
  • 1 0
 Not all non-Aluminum cranks are Carbon Fiber
  • 1 0
 Broke a XX1 and SixC crank arm
  • 1 0
 Seems to me that the weight saving is totally worth it. Lolololol
  • 1 0
 i mean, can we put a timeframe on this, ISIS drive cranks BOOOM
  • 1 0
 Dont know!!! I run Saint cranks on all my bikes. Never a single problem!!
  • 1 0
 i thought it said collar bone at first
  • 1 0
 eeeeEEeeeeEEEEEEEwings!!!!!
  • 1 0
 What about bending...?
  • 3 0
 To me bending is a failure.
  • 1 0
 @onemanarmy: once again i have failed
Below threshold threads are hidden

Post a Comment



You must login to Pinkbike.
Don't have an account? Sign up

Join Pinkbike  Login
Copyright © 2000 - 2021. Pinkbike.com. All rights reserved.
dv65 0.029012
Mobile Version of Website