Specialized Stumpjumper FSR Comp Review

May 21, 2012
by Richard Cunningham  
 
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TESTED
SPECIALIZED
STUMPJUMPER
FSR COMP
BY Richard Cunningham
Lindsay Currier runs the Specialized FSR Comp down the rocks at Ted Williams.


Specialized honed its FSR rear suspension and aluminum frame technology to near perfection on the Stumpjumper series, and the $2750 FSR Comp benefits hugely from a raincloud of innovations and improvements developed for upper-level Stumpies. Its component spec is decidedly XC/Trail, with a sweet SRAM two-by-ten drivetrain, a fast-rolling tire combination, a Fox Evolution F140 RL fork and made-for-Specialized Float Fox Triad II shock. Its handlebar is wide and the frame geometry is slack enough to qualify as a ‘modern trailbike design’ without giving up the desirable quickness of an XC bike. The beautifully crafted frame has plenty of stand-over clearance for technical riding, ISCG chainguide mounts in case you want to run a single ring later, a 142/12 through-axle, and plenty of room for tires up to 2.4 inches. In short, the 140-millimeter-travel FSR Comp inherits indelible Stumpjumper trailbike genetics, but its creators added gravity features to ensure that it could hold its own if it got into a tussle with a pack of muscular all-mountain bikes.

Pinkbike All Mountain Bike Shoot Out
  Stumpjumper FSR Comp Highlights:

-Frame: Manipulated aluminum frame tubes, 140mm travel, tapered head tube, 142/12mm thru-axle, ISCG-05 chainguide tabs
-Fork:140mm stroke, Fox Evolution F140 RL, standard dropout
-Shock: Fox/Specialized Triad with Autosag
-Chainguide: 'Dangler' integrated guide and chainstay protector
-SRAM X.9/X.7 two by ten drivetrain with bash guard equipped crankset
-Sizes: Small, Medium, Large, X-Large
-Weight: 28.1 pounds (med)
-MSRP: $2750 USD

Ian Hylands photo


Construction Notes

Surprisingly well executed for a mid-priced model, the Stumpjumper Comp’s aluminum frame is painted with the quality and detail one may expect on a custom bike. Each main frame tube is manipulated in some way. The forked top tube has a tapered organic shape, while the seat tube morphs from round to square as it curves forward to support the upper suspension linkage. Look closely and you might notice the internal cable routing for a dropper post (RockShox Reverb or Specialized Command Post). Not so creative is its beefy downtube that copies the ubiquitous Northwest ‘hockey stick’ bend. A look at the bottom bracket area reveals a sturdy ISCG-05 chainguide flange and Specialized’s version of BB 30 – an oversized bottom bracket axle and matching press-in bearings that, in this case, house a non-series Truvative crankset.

Specialized Stumpjumper FSR Comp Geometry

Geometry and Avid Elixir 7 SL brake


Most of the Comp’s fireworks go off in the rear of the chassis, where the front derailleur operates on an extension of the swingarm so its geometry remains in line with the chain as the suspension cycles. The swingarm features internal routing for the rear derailleur housing, a 142/12mm through-axle and a trick-looking Moto-inspired XC chain guide that is molded into a beefy plastic chainstay protector. All the rear pivot points are clevises, which are the optimum design for those locations, and the shock is mounted on a yoke that keeps the upper rocker link short and stiff while controlling undesirable rate changes. As a side note, the non-standard shock might cause problems if you desire an upgrade later, or if Specialized moves on to yet another ‘proprietary’ shock design and leaves its previous customers short on spares (Just sayin’).

Component Check

Mid-priced performance bikes are by nature, a series of intelligent compromises, and Specialized is one of the best at the game. The use of in-house components helps maintain important features like a wide handlebar, lightweight wheels (Roval Control Trail rims), a comfortable saddle (Body Geometry Henge) and high-performance rubber (folding-bead Ground Control 2.1 rear and Purgatory 2.2 front) while saving up some cash to purchase brand-name items like its Fox Float RLC fork. Brakes are Avid Elixir 7 (Rotors: 160mm R /180m F), which feature a handy reach adjuster under the lever blades and integrated shift-lever mounts. The drivetrain is a mix and match, with a high-profile X.9 mid-cage rear derailleur, an X.7 front changer, powered by X.7 shifters. The non-series two-ring Truvativ crankset is actually an upgrade, as it has a bash ring and perfect-for-trail-riding, 38 x 24-tooth gearing, matched up with SRAM’s PG 1030 ten-speed 11 x 36 cassette.

Missing is a dropper seatpost which, it could be argued, would push the Comp well out of its under $3000 price point. That said; Specialized produces its own dropper post and thus, has the economy of scale to make it appear at lower price levels - providing that it puts its brain trust to the task. Get on it guys!

Stumpjumper Comp Trail Test

With 140 millimeters of suspension travel and 26-inch wheels, the Stumpumper FSR Comp is on the razor’s edge of being eaten alive by the popularity of 100 and 120-millimeter 29ers. The Stumpjumper Comp rides and feels a lot more like a cross-country trailbike than an aggressive all-mountain ride puts it squarely in the path of the big wheel bike. To stay ahead of the 29er, the Comp, it must to be lighter, more nimble and its suspension must be able to handle bigger jumps and drops.

Lindsay Currier rides a Specialized Stumpjumper during the Pinkbike All Mountain Bike Shoot Out
  All who rode the FSR Comp were impressed by its easy climbing and straight-line speed. The 24 x 38 crankset gearing was welcome when shuttling was not an option. Ian Hylands photo


For the most part, the FSR Comp flies the 26-inch flag proudly. Its extra measure of suspension travel is a big plus, with a cushy feel landing to flat and handling G-outs and it punches through bumps like reasonably sized logs and rocks with a firm, controllable feel. Its wheels and tires stay on line when pushed hard around corners and there is a sense of solidarity between the wheels, suspension and frame when the bike is ridden near its limits. The smallish 2.2-inch Purgatory Control (F) and 2.1 inch Ground Control (R) tires are tacky in the turns and roll quite fast on the harder sections of the trail, but they miss the mark over rough terrain, bouncing and skipping where a 29er shod with similar-width rubber would maintain composure.

Pedaling/Acceleration: At just under 28 pounds, the medium-sized FSR Comp is one of the lightest bikes in the $3000 trailbike category. Add its fast-rolling Purgatory Control and Ground-Control tires and firm-under-pedaling rear suspension and the Comp gets moving in a hurry. While it lacks some of the snap of an XC racer, the FSR Comp maintains momentum, rolling easily up and over small rises and reaccelerating out of slow corners with a few swift pedal strokes.

Climbing: With a slightly slack, 68-degree head angle the FSR Comp’s front end stays put and steers straight. Its compact, 429mm (16.5”) chainstays and full-time suspension action keeps the rear tire biting, so the ‘Comp is also an easy climber. Its 2.1 inch rear tire, however cannot deliver grip to match the technical ascending potential of the Stumpjumper chassis and it often spins the rear wheel at the crux of a climb. Wider rubber in the rear would be welcome. Specialized chose beautifully low 2 by 10 gearing (24 x 38 up front and 11 x 36 rear) with excellent spacing across the range, so little speed is lost while dropping gears up a steep pitch and the stump-pulling 24/36 low gear gives the rider enough grunt to top some serious pitches where traction is available.

Technical handling: With moderately wide handlebars (720mm), numbers that give it a balanced feel fore-to-aft, and a steady-feeling 68-degree steering angle, the FSR comp is quick around corners and when the tires break, it drifts with a high level of control – an event that an intermediate rider can enjoy. Dropping down steep chutes requires some courage for those who are used to slacker head angles and depend on rear-wheel braking. The Stumpy FSR Comp’s rear rubber doesn’t add much control down steeps, but if the rider stays calm, the Specialized will come out of most any situation rubber side down.

Downhill: In the gravity segment of testing, the FSR Comp was not the most favorite choice, although every rider remarked that it was sharp in the corners. As a jumper, its suspension is as capable as a bike with a 32mm-stanchion-fork can be, with smooth landings and big-bump performance that is head and shoulders better than your typical XC machine. In confident hands, it rips, but the FSR Comp will not inspire the complete confidence of an intermediate rider when descending the type of rutted, technical tracks that define the realm of a dedicated All-mountain chassis.

Multi shot Fox Evo fork Triad Shock BB detail
  (Clockwise) Fox Evolution F140 RL fork was firm enough to impress racers, but ran a bit rough over the chatter. Specialized gets high marks for its super-simple Autosag air pressure setup on the Fox Triad shock. Extra credit for the oversized BB30 bottom bracket and the ISCG-05 chainguide.


Suspension Action: Specialized gets the nod for co-developing the Fox Triad II shock with the Autosag function. To set the shock’s air spring, one need only pressurize the shock to 300psi, mount up and then release air from the red Autosag valve until air stops escaping. In two steps, proper sag and air pressure are achieved. The downside is that one never gets the chance to play with alternative settings. The end result is a firm feeling damper that makes full travel when pushed hard. We rarely used the two Pro-pedal settings, preferring to leave the damper wide open unless we faced a long climb.

Up front, the open-bath Fox Evolution F 140 RL fork was capable of knocking the edge off of big hits, and was very stable under hard braking. The feel while cornering was secure, with the fork assisting the chassis to remain level and in control. Over the chatter and at lower speeds, the fork felt harsh and this added a level of fatigue at the handlebar grips.

Oddly, Specialized chose a standard dropout configuration for the fork, and paired this with a quick release 9mm through-axle. Oversized flanges on the Specialized hub, combined with the beefy axle are reported to deliver lateral stiffness that nearly equals a 15QR setup. While that claim may be true, the funky axle configuration blends the most hateful aspects of a standard quick release system, with some of the drawbacks of a through-axle. It made it difficult to line up the rotor and bothersome to get the axle spaced properly to slip the wheel into the dropouts – fail.

Component Action: While the FSR Comp’s 720mm-wide handlebar was a good product spec, the bend felt harsh on the hands and wrists over the long haul. Some riders did not sense this, so it may be pure preference. The Body Geometry saddle looked like a cheapie, but turned out to be comfortable. We have bagged on Avid Elixir brakes in recent tests, but Specialized spec’ed strong-stopping semi-metallic pads and up-scaled the ‘Comp to the Elixir 7-series brake which features levers with a sensible reach adjustment dial. We had some vague shifting troubles with the SRAM X.9 rear mech that we attributed to the bike’s cable routing. It was an intermittent problem. Both the derailleur and shift lever checked fine, but we encountered slow-to-respond gear changes in the smaller cogs throughout the test period.

Pinkbike's Take:
bigquotesSpecialized's FSR Comp remains true to the Stumpjumper heritage, which means that it rings all the bells that make XC/trail riders happy. With evolutionary improvements like the 'Dangler' chainguide, two-by-ten drivetrain, and modernized steering geometry, the FSR Comp is as sharp of a performer as you will find in the 26-inch-wheel XC/Trail category for under $3000 - and that more than qualifies it as a must-ride for anyone in the market for such a machine. Aggressive trail riders who shuttle descents and hit up a ride park now and then will probably want to upgrade the FSR Comp's tires, add a dropper post and possibly move up to a more capable fork - all of which defeat the economy of the bike's MSRP. The Stumpjumper FSR Comp is an excellent performance value that gives an XC/trail rider access to the long-travel all-mountain realm without having to commit to it. - RC


Five-Bike $3000 AM Tests:

1 - Cannondale Jekyll 4
2 - Specialized Stumpjumper FSR Comp
3 - Giant Reign 1
4 - Santa Cruz Butcher
5 - Norco Range 3



Must Read This Week

100 Comments

  • + 25
 Through axle on the rear and qr on the front? Sounds like specialized's spec department got a bit confused...

I had the chance to ride a stumpy recently at a demo day, the rear suspension definitely felt nice and active and ready for some thrashing although the slightly longer stem they had on the bike was a little off putting. Shove a short stem on the bike and it'd be more than ready to let loose on some downhill tracks; saying that the bike is XC oriented definitely doesn't do justice for what is a very good and very fun bike all round.
  • - 3
 Like my bike! Shorty Thomson stem, Pro Taper DH bars, Reverb, and now you're talking. Still dont know about the rear tire though.
  • + 20
 "Aggressive trail riders who shuttle descents and hit up a ride park now and then will probably want to upgrade the FSR Comp's tires, add a dropper post and possibly move up to a more capable fork - all of which defeat the economy of the bike's MSRP."

Don't even bother mentioning the EVO Comp is almost the same price and has all these things.
  • - 1
 And is sold out. Also, Purgatory's are plenty grippy. Not sure on the GC.
  • - 12
 and the combat seatpost is lethal, total ruins the bike in my opinion go on give me neg props
  • - 4
 the dropper seatpost that comes on the evo
  • - 6
 To be fair though apioqm, someone at uni has a stumpjumper evo that I got to ride round the car park before getting to demo the normal stumpy properly. I don't think I'd want the evo as the standard is low and slack enough; the evo takes it too far and loses some of all round attraction that the normal stumpy has!
  • - 3
 I will have to say that I have ridden both a 2011 stumpjumper and a 2011 trek ex 9 and while the Trek ex's rear suspension was much smoother and more capable in every aspect over the stumpjumper even though the stumpjumper had another 20mm of travel, like they said I have NEVER ridden a bike with better geometry than the stumpjumper.
  • - 2
 The stumpy evo really goes out of the category of an XC bike, then it is really considered All mountain
  • + 1
 The front hub is supprisingly stiff, but kinda weird. Understanding that they are using a trough axle is a selling point for the next model up, I have to say " if we are spending this much money put on the fu$@!ng though axle and skip the bs.
  • + 5
 I have and completely swear by this bike, BY FAR the most capable bike out there. Almost more fun to downhill on than my faith. Recommended 100% by me!
[Reply]
  • + 24
 "The 24 x 38 crankset gearing was welcome when shuttling was not an option" really, shuttling a 28lb bike...? This is mountain biking, pedal... Save the fun of shuttling for big bikes and big trails.
[Reply]
  • + 12
 All I could think while reading this is how it was formatted and sounded like mountain bike fiction, complete with the trademark excessive and ineffective metaphors throughout
  • + 12
 Wow, I just noticed that my comment basically saying the same thing has been deleted. Welcome to censored corporate journalism PinkBike.
  • + 6
 I agree, it sounded like shitty MBA.
  • + 3
 most honest piece of journalism i've read on here poozank, well said. although the bike is very nice
  • + 8
 totally agree. big mistake bringing rc on. pinkbike reviews are just formatted mba reviews. pure crap
  • + 6
 The whole article is just garbage. It is not a good read and doesn't leave me interested in the bike.
[Reply]
  • + 7
 I don't get calling the _bicycle_ "aggressive."

Bicycles just _are_. They're not living beings and they aren't endowed with attitudes.

Even a DH race bike isn't "aggressive." Don't believe me? Try riding one on a typical midwestern USA XC beginner category race course. See how "aggressive" that bike feels in that setting.

What makes a bicycle look as though it is "agressive" is the rider who's operating it.

I guess there's some point of selling images -- i.e., "buy this bike and put it on your bike rack, and it will have someone in some trail head parking lot somewhere imagine you are an 'aggressive' rider."

This theme is everywhere in the above review. It reads like it's functioning as a piece to sell an image to young boys who might have an identity problem (i.e., "people think I'm a wuss, I need to project a more AGGRESSIVE image").
  • + 6
 I think you understand what they are saying when they call a bike "aggressive". Aggressive = slacker geo/stronger parts relative to the competition and therefore capable of more aggressive riding (though that is mostly up to the rider).

DH is the upper limit. There is little room to argue one DH bike is capable of more aggressive riding. There is however a lot of room for play in the "trail" and "all mountain" categories. Obviously riding a bike designed to go downhill will be terrible on an XC course. That point is... pointless...

Yes most of this is just marketing but personally I like having some classifications because mountain biking is so diverse. It makes it a lot easier to discuss aspects of the sport with friends and fellow mtbers.

Finally, they never actually called the bike aggressive. They described the ride characteristics as aggressive and geared towards aggressive riders...
  • - 2
 You've got to be kidding me. RC calls it an "aggressive trailbike" several times.

It's lousy, cliche- and image-boosting writing, that's what it is. It's marketing, rather than informing. Selling, rather than analyzing. Fluffing, rather than... well you get the picture I'm sure Mr J T Nord.

If you can't look at a bike's geometry and spec and figure out how well it would work for you, RC's labelling won't do that job. It's just like that obnoxious phrase "black diamond" he tried to push on everyone a decade ago. We don't need more (or "better") labels or categories.

I ride singletrack on a singlespeed CX bike sometimes, and pass people riding $6k wonderbike Ibis Mojos. It's not about the bike label or category -- EVER. Just ask Mike Montgomery. youtu.be/fPn4fDqL7f8
  • + 1
 If you do a ctrl/cmd f and look he uses the term "aggressive" exactly 2 times and neither time did he call the bike aggressive...
  • + 1
 yeah if anything he states its NOT agressive. but i see you're point, if a bike is not agreessive then what is it? i've found the term agressive aplied in the opposite - aggressive geo for for competitive XC racing and climbing...
  • - 5
 Hah hah hah. jtnord thinks ctrl/cmd f is the same as reading. Hah hah hah. I bet you imagine your iPhone's 4th rate GPS tells land speed better than a radar gun or analog speedometer too.

When I read this article the morning it popped up, "aggressive bike" was in it repeatedly. It was even in the header from the PB front page.

Y'all keep fluffing RC though. Seriously, does he give you schwag for this?

WasabiJim, geometry cannot be aggressive. It just exists, and it is an inanimate construct. The whole point of talking "aggressive" this or that is to sell an image -- as I said in my first entry above.

"For all you henpecked husbands who are browbeaten at work and never feel a moment's masculine energy or power -- we've got your image right here in a MTB! It's AGGRESSIVE in all the ways you WISH you were!"
  • + 1
 i'm not arguing with you but pointing out how ‘aggressive’ can mean whatever you want it to
  • + 2
 "Aggressive" is an adjective... describing or selling words is what adjectives do... some people enjoy reading articles with too many adjectives, others call it sensationalism, some people require anecdotal evidence to be satisfied while others prefer their reviews to be qualitative and objective... nobody can satisfy everybody!
  • + 1
 I was thinking to myself "man what kind of a f*cking idiot is this guy?" Then I looked at the username. It all makes sense now. Charwee is at it again!
  • + 3
 CFOxtrot I like how you had to resort to childish personal attacks when you were proven wrong. Maybe the term aggressive was in the article more when it was first posted but it appeared exactly 2 times when I read it, as it still does. RC said the bike was not aggressive or needed upgrades to satisfy more aggressive trail riders. I dont even care, I dont know why I am arguing with you...
[Reply]
  • + 2
 Just a note, those are not true Roval Control Trail wheels. I have the 2012 SJ FSR Elite, and though the rims say control trail on the graphic, they have a different spoke count, different hubs, straight gauge spokes (not butted), and are much heavier than the retail version. They are solid wheels, but no one should get excited into thinking they're getting the actual Control Trail wheelset that specialized sells. I was a bit bummed myself when I found out. Otherwise an amazing bike!
[Reply]
  • + 1
 I love my stumpjuper! I am a dirt jumper and free rider and needed a trail bike and this fits it perfect. It is not a quiver killer, but fits most riding really well. It would have been cool to get a transition trail bike, but for the price you can't beat it. Wait till end of the year and you can catch one for under $2000!
[Reply]
  • + 1
 DOES ANYBODY UNDERSTAND THIS ISNT AN ALL MOUNTAIN BIKE? The Enduro is specialized's all mountain bike. This is a TRAIL BIKE. It wasnt designed for the downhill. The enduro comp(not the enduro comp evo, but just the comp which costs $3000) is what they should be testing, not the stumpjumper. I have owned both and can say that the Enduro will kick the stumjumpers but at all mountain riding because the Enduro is an all mountain bike. Thats not fair for Pinkbike to do that. Its comparing apples to oranges. You wouldnt compare a Demo to an Epic. It makes no sense. But that is exactly what Pinkbike is doing here.
[Reply]
  • + 5
 haha sumpjumper
[Reply]
  • + 0
 This bike will benefit from the 34mm stantions with a 15-20 axle they will inevitably decide to put on it next year. Throw that in and make it a talas fork and suddenly you've got a top notch trail rig. It pushes the envelope a bit much for xc. After all, what xc rig really needs a chain guide if it is set up right?
[Reply]
  • + 2
 Is it just me or does the brake rotor go through the dropout on the 5th picture?
  • + 0
 It is just you. The wheel is just not mounted.
  • + 0
 they just wanted to show how it has a shitty 9mm dropout, instead of 15QR like most the legit 3000 bikes......giant trance x3. But the giant has a 9x135 rear....so...who knows. steering dampers if you ask me.
  • + 1
 F**k 15QR, 20mm through axle is best
[Reply]
  • + 0
 haha, don't you hate it when your friends get nicer bikes then you when they have never biked in their lives? ya, one of my friends just got that stumpy and another got an sx, and none of them have ever biked in their life
  • - 1
 So you are pissed that they have found better fortune than you and enjoy nice stuff?
[Reply]
  • + 2
 ha! xc orientated? you havent seen Craig Evans ride his! seen some full on rippers on these bikes,
  • + 1
 I think craig has the evo which is a bit slacker and has 10mm more travel front and back
  • + 3
 wade simmons and thomas vanderham had also a pretty sick run on the rocky mountain element, but i think it's still a cross country bike Wink

btw: vid is here www.nsmb.com/5198-wade-and-thomas-shred-on-element
[Reply]
  • + 2
 I like my stumpy. But i want a enduro next year! m.pinkbike.com/photo/8120464
  • + 1
 I agree, They should do a review on Enduro Evo its also under 3 grand. But who cares what they say by one anyway.
[Reply]
  • + 0
 So this bike has some negative sides, like most mid-price range bikes have. Which bikes would be valid replacements for this Stumpjumper? Keeping the same price rang an about the same specs in mind that is....
  • + 1
 This is an all mountain test. They shouldnt have even tested the stumjumper. The enduro comp is 3000. The enduro comp evo is 2750? I dont think anything below 150mm of travel is all mountain. The stumpjumper comp evo is 150mm of travel. That would be a valid replacement.
  • + 1
 Nevermind. The only all mountain bike specialized makes under 3000 is the Enduro comp evo, and even that is geared more for downhill. That bike confuses me. The enduro evo has 170mm up front and 160mm in the rear. The status 1 has 170mm up front and 200mm in the rear. I dont even see why the produced both of these bikes. There both coil sprung and probably weigh close to the same. In my eyes they manufactered the same bike twice. Why?
[Reply]
  • + 2
 I love bikes! I had to write something because I was editing an entry.
[Reply]
  • + 1
 the 2012 stumpys have iscg mounts now? aww man, shoulda waited another year
[Reply]
  • + 1
 beat the shit out of it and then drop some cash on a new fork, wheels and tyres
[Reply]
  • - 2
 I have riden bikes with Fox Float forks. 32,s 36,s .They all felt plush on small bumps. Some of the plushest forks I've ever felt...this Fox fork feels harsh on small bumps.? Hand fatigue? The re is somthing wrong with the fork. Or the fork is custom tuned for this bike......bummer.
  • + 3
 a 36 that feels plush on small bumps as yet to be seen !!!
[Reply]
  • + 2
 Why would they do QR up front?
[Reply]
  • - 2
 Sucks that some manufacturers are using BB30 instead of a traditional BB. BB30 sucks for road bikes(creak, creak), why put it on mountain bikes? Marketing hype I guess.

Has Synyard apologized for his wrongful lawsuit against Volagi yet? Only we can make red bikes with ugly graphics!
  • + 6
 Been riding mine with BB30 since February, with no noise at all. All conditions.
  • + 2
 Synyard won the lawsuit though. Volagi had to pay him a huge 1$ in damages
  • + 3
 its not BB30 - its PF30 (push fit 30mm) this uses nylon (Delrin) cups pushed into the BB shell, and then the bearings are sitting in these cups, rather than bearings directly set in the frame's bb shell, which caused creaking problems on BB30 bikes in the past

the comments about the DT Swiss Q/R skewer and OS24 axle caps causing" It made it difficult to line up the rotor and bothersome to get the axle spaced properly to slip the wheel into the dropouts – fail." seem very odd??

I have the same setup on my Stumpy Evo 29er and it works fine (and feels like just QR15 in terms of chassis stiffness), its easy to get wheel in and out of fork, and no issues with disc brake?
  • + 2
 BB30 rocks !!!...internal is the way to go !!!...we're not talking about a crappy PF30 here...
  • - 4
 Sinyard lost. Sinyard spent like half a million on lawyers to "win" $1. I also believe 3 of his cases against Volagi were dismissed. But mainly he lost because he lost customers, mainly roadies and their $$ He also lost respect within the industry.

BB30, PF30, they both suck. No real advantages, just disadvantages. Don't even try to tell me there is a noticeable difference in stiffness, thats marketing BS. You think delrin bushings in a bottom bracket are better than metal threads for the long term? Hell no. The companies like it because if their tolerances are off on the BB it doesn't matter, just shove the plastic BB in. They also save money by not threading the BB. Loctite should not be necessary when installing a BB, but it usually is with theses crap systems.
  • + 3
 BB30 = 30mm axle !!!...yes Protour, there is a significant stiffness difference for a 200lbs sprinter like me...why would you even want to compare crappy outboard bearing cups to the BB30 standard and frame design ???...there is a reason why every single pro rider runs internal bearings nowadays !!!...what is that creaking bike that you're talking about anyway ???
  • + 1
 +1 on the DT axle. i have this axle on my camber pro 29er and would say its comparable in stiffness to 15mm TAs that ive ridden. definately more so than it is to a QR. and it fits pretty precisely in the dropouts so rotor alignment has never been a problem. i would consider it a ratcheting bolt on axle more than a QR.
  • + 2
 hummm,,,,I would still prefer a 15mm or 20mm thru-axle over any QR's unless fast wheel removal is an issue !!!...
  • + 2
 @Protour

PF30 has proven to work very well

the increase in "stiffness" (resistance to flexure) that is talked about is a combination of the 30mm through axle on the crankset and more importantly the substantially larger diameter BB shell which allows the company to use larger diameter, thinner tubing in the bottom end of the frame (for lighter weight) whilst increasing frame stiffness in the bottom end

As tube diameter increases, stiffness dramatically increases, the engineering rule of the thumb is "doubling a tube's diameter will increase the tube stiffness 16X", obviously moving to larger diameter tubing has its compromises with wall thicknesses vs. weight so you don't get buckling ("beer canning") tube failures in impacts

Threaded bottom brackets have caused nothing but trouble since day one and are a left over from the old days of road cycling, you would not believe the bikes we get through our workshop with threaded BB's, seized threaded BB's, etc.

BMX certainly has improved since moving to push-fit "Spanish" and "Mid-Size" bearing systems for the BB design, whereas the short-lived flirtation with the threaded euro shell was a disaster both in terms of bearing durability and frame damage


Push fit tolerances do actually need to be good, otherwise problems result, especially for BB30 where the BB shell has a machined seat for the bearing, and even for PF30 where the delrin cups are isolating the bearings from the frame's BB shell, rather than taking up vague tolerances.

The older, threaded BB systems do not allow the bearings to sit completely parallel, if you study the design, as the threads are angled which places unequal loads on the bearing system

With push fit systems you can have parallel bearing alignment and easily adjustable preload, its a very very easy system to work on compared to traditional threaded BB shell with BB thread cutting and facing tools.
  • - 1
 What a bunch of bs. Have fun smelling the loctite.

"Threaded BBs have caused nothing but trouble since day one and are a leftover from the old days of road cycling"

Not my fault you never figured out how to use your tools, cause most mechanics do not feel this way. Know what a cheater bar is? It's better than using a hammer on your bb.

Another reason PF30 sucks is because the bb often gets destroyed when you hammer it out, so you can't just count on swapping your bb to a new frame. Plastic disposable garbage.

Velo News had a great article a couple months ago where they exposed the weaknesses of the new garbage bb standards and talked about how they missed threaded bb's. Even the roadies don't think the minor amount of extra stiffness is worth it. You shouldn't have to loctite your bb, what a bunch of bs.
  • + 1
 sorry dude..

..not a case of not knowing how to use BB tools (have been wrenching since 1991, currently a workshop manager for a shop with multi-£million turnover...) but threaded BB is an old design left over from the days of road cycling


have not "destroyed when you hammer it out" because we don't use a hammer to remove BB30 or PF30, we have specific tools for that application, perhaps you need to research that further....

have easily extracted PF30 cups without damage, replaced grauncy bearings and refitted without any damage to the cup or new bearings?

did not mention loctite in my posts? why would you loctite PF30 BB??

speak to leading frame designers about the advantages of push-fit, and it might become a little clearer...
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  • + 1
 Didn't this bike used to be called the Pitch?
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  • + 2
 I want me a ??? shock!
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  • + 1
 Hmmm... Bet that front brake works well.
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  • + 0
 The use of flash in the ride photos = cheesy. Artificial. Hyper-commercialized.
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  • + 1
 gearing on these is kind of low
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  • + 1
 Shancion? Maybe read over the "downhill" section a couple times
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  • + 1
 Stumpy!!!! Excelente bike me compraria ahora una 29
  • - 1
 Yo tengo la de carbón y está poca madre, sube como si nada y baja muy bien.

saludos
  • + 2
 Tengo la stumpy evo, tambien es una chingonada
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  • + 1
 Your mums aggressive!
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  • + 1
 This isn't really comparable to a pitch is it? I mourn the loss of the pitch I think it was an excellent platform for many riders but this has a Brain amongst other things i.e. cross country tyres/gearing/wheels.
  • + 4
 ... doesn't have a Brain...
  • + 1
 very true my mistake!
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  • + 1
 Hardly original though... that's how most chainguides were twenty years ago. A simple delrin guide or roller that bolted under the chainstay and behind the crankset to lift the chain mid-span.
  • + 0
 Wow they have invented the DCD !
  • + 1
 Dave's Chain Device (DCD) was a turd that sold 100s before anyone realised how ineffective it actually was

Bullet Bros derailleur tensioner was a much better product, from that same era Wink
  • + 0
 Now come on you had to have both to be a cool kid
  • + 1
 I had the DCD and realised it sucked b*lls, made lots of noise, friction to the drivetrain and marked the chainstays but not so effective at retaining the chain on rough ground!

then got the Bullet Bros chain tensioner

can see it on the back of this Bombproof race bike

ap1.pinkbike.org/p4pb5488180/p4pb5488180.jpg

This was installed with the long alloy plate mounted under the rear wheel skewer / rear wheel axle, against the rear dropout) and then a machined piece was bolted to the tip of the derailleur cage, with a long spring connecting the two...looked crap but worked great??

happy days!
  • + 1
 I had a DCD on a Zaskar but when I changed the frame for an atx990 the DCD didn't fit so got the Bullet Bros instead. As the DCD has made a come back I wonder if the Bullet Bros will.
  • + 1
 I had them both, they both had issues. Daves was noisy, and the Bulet Bros was associated with exploding rear derailleurs. And your chain could still fall off, and if it did with the Bullit Bros you would usually have a bad case of chainsuck cause the derailleur had more tension on it so it would pull it into the BB between the frame and the cranks, and you would really have to yank on it to get it out, sometimes tweaking your chain or scratching the frame. Then the home made MRPs came along, first in the NW, then within a year all the pros had them.
  • + 2
 @ Protour

agree with your comments, neither was a permanent solution, we ran Sachs New Success and Quartz rear mechs (our DH factory team was sponsored by Sachs) and we found that friends using the Bullet Bros with Shimano mechs, had a lot more problems than we did with our Sachs mechs

we moved onto taking massive chainrings and grinding all the teeth off using an angle grinder to create 2 "sandwich" plates which would be bolted either side of the front single chain ring, to create a crude chain bash guard / chain keeper

all kinds of experiments were going on back then!
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