Here at Pinkbike, we get inundated with all kinds of questions, ranging from the basic "Can I have stickers" to more in-depth, soul-searching types of queries like if you should pop the question or what to name your first child. Ask Pinkbike is an occasional column where we'll be hand-picking and answering questions that have been keeping readers up at night, although we'll likely steer clear of those last two and keep it more tech-oriented.
Going Tubeless Without Protection?Question: @ItsMartY asks in the
Downhill Forum:
Hey guys, I'm considering going tubeless. I need your advice. I got stock Alex rims on my bike but they're tubeless-ready and pretty durable for me. I know that tubeless has no disadvantages but I don't want to spend so much money on Cushcore or something like this. I like to ride jumps, brap berms and this stuff but I'm only 66kg, so I think it would be no problem, what do you think? Should I go for it without CushCore or no? I have front Assegai kevlar tubeless ready but my rear is DHR 2 Dh casing not tubeless-ready. | Consider no more, you should absolutely go tubeless...especially if your bike is as close to being ready for it as it sounds. Tubeless is really the best way for most riders to get more performance out of their bike by giving their tires a better feel through the ability to run lower air pressures, which increases traction, increased protection in the event of a puncture, and it's less weight. Now, if you're going to set it up tubeless and then let your bike sit and not ride it (you know who you are), the sealant will eventually dry up and fail to work. Older tires that don't fit tightly on the rim or seep sealant also present problems, so keep that in mind but, if you ride much at all tubeless is the way to go.
Now as far as using tire inserts goes, I weigh a bit more than you and rarely use any sort of a tire insert. Inserts are good for a lot of things, and may keep you from dinging your rims and getting pinchflats at lower pressures, especially when you're riding really technical terrain, but they do add rotational weight and are more challenging to set up. They also offer the benefit of keeping the tires standing up a bit more when you're going into turns. Personally, I typically opt for a heavier duty casing tire before considering an insert.
The bottom line? I think you'll be totally fine as is, without a CushCore and if I were you, I wouldn't fuss with it - especially for riding flowy trails. You may end up being able to get that rear tire set up with just some sealant but, I'd always recommend using a tubeless-ready tire...insert or not.
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Problems JumpingQuestion: @itay123 asks in the
Downhill Forum:
Hey guys, I’ve been biking for some time now but my area has a lack of real jumps. As such, whenever I go to bike parks I notice I tend to case most jumps at best, and far more often than I would like I feel my feet come off the pedals. Any advice on keeping them planted and getting a little further to clear the jumps? | This is an issue a ton of people have and if you ask around, you're bound to get a lot of different advice. I decided to get the word from someone who is no stranger to jumping and coaches people on how to get in the air daily, Walker Shaw.
Walker suggests, "One thing that I feel really helps get the comfort level higher on bigger jumps is practicing bunny hopping. This could be done around the neighborhood or anywhere really. Bunny hopping with flat pedals and not relying on your suspension or clip pedals is going to help with bike awareness and is a key fundamental skill as you continue to progress. While "clip" (clipless) pedals may be beneficial when it comes to pedaling efficiency and at times being able to unweight the bike through chattery sections of trail, I don’t see them as something you should ever rely on, especially when jumping.
As far as keeping the feet on the pedals, I would play around with different shoe and pedal combos to find what works best for you. The mix of grip and comfort is important as being able to feel the pedal underneath you can help you feel at one with the bike."
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NX or GX or?Question: @RonB asks in the
All Mountain, Enduro & Cross-Country Forum:
Hi! Looking for some user feedback. I am currently riding a 2019 full susp with 1x NX drivetrain. No issues with it, but see a lot of good, bad and ugly being said about that line. Is the GX line that much better? Would I benefit from upgrading to GX, or should I consider going a step higher? I am NOT a basher, speed demon, or jumper.... just an old man that enjoys riding most everything and wants things to work good. Thanks for any assistance! Ron | "If it ain't broke, don't fix it." That certainly can apply here, especially if you're happy with what you're running but at some point, you're going to eventually wear out some components of that drivetrain. Is it worth upgrading? I find that the GX does shift ever so slightly better, as it should, but it's a marginal gain. The big upgrade there is going to be that it's lighter, and you'll also get a MatchMaker compatible shifter, which will make it easier to get that cockpit setup just how you like it. Go on up to the XO1 and, you guessed it, even lighter and a much nicer shifter.
One thing to keep in mind is that with the NX group you're using, the cassette works with a HG (Shimano style) freehub body and the GX uses SRAM's XD driver. At the very least you'll have to switch out the freehub bodies on your hub, and that's if you can interchange them. It's not always cheap. At worst, you're looking at a new rear wheel with a compatible hub.
It's also certainly worth looking at Shimano's HG compatible drivetrains. Their SLX or XT systems offer a lot of performance for the price but, you're not going to have as wide of a range in the back without going to their new Microspline freehub body and, you guessed it, that's not the same as HG.
The bottom line is you have some options but, without upgrading that freehub body, you're going to be limited to a more entry-level cassette or a smaller gear range than you currently have. That's not to say you can't upgrade the rest of the drivetrain and stick with a NX cassette, but your biggest performance gains will come from a nicer cassette, so invest wisely.
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Is a 58-degree head tube angle too slack?Question: @Tripmo asks in the
Downhill forum:
Hello guys, I just finished my mullet setup on my bike. I used one of those phone apps to measure my headtube angle, it's around 58.6ish. So roughly I have a 58-59 degree headtube angle. Is this too slack that can make my frame snap? Little worried. | What was your head angle before? Looking at the numbers, if you only put a smaller rear wheel on the bike I would have expected the head angle to change by 2-degrees or so, which would mean that you started with a sub-62 degree head angle, which is already very slack. I'd start by re-measuring to confirm that number. If you're on a DH bike, you can run the crown of your fork low as possible (measure this) or consider reducing the travel of the fork by 10mm or so to level things out a bit and get a more reasonable geometry. You could also use angle adjusting headset cups to steepen things up to a less extreme number.
Going that slack on a DH bike with a dual crown fork isn't as concerning as it would be on a single crown trail bike, but along with the potential for sub-par handling on everything except the steepest tracks, I'd also be worried about the extra stress on the headtube, and on the fork's performance. Grim Donut aside, there is a point at which things get too slack, and you may have passed it.
The easiest solution is to stick the proper wheel back on the bike and have a worry-free ride; at the very least I'd look into the various ways to bring that head angle back over 60-degrees.
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Pain in the butt to install at first, but I won’t go back to just regular tubeless ever again.
I ran cushcore on my enduro bike for a season. The dampening felt nice, and it did feel more supportive in the corners, but it wasn’t worth the downsides.
- I could not run less pressure without denting the rim and snake biting more often (pinching bites right through the insert like it’s made of peanut butter)
- The weight was VERY noticeable.
- They are a PITA to mount.
- I got more sidewall tears (on Double Downs) using cushcore. Maybe it was just bad luck, but I had only torn one DD sidewall without an insert, ever. With inserts that summer, I had THREE SIDEWALL TEARS!! I believe their “sidewall support” comes at a price.
Love my Vittoria inserts. I was able to ride a flat that was to damaged for sealant for 2 miles even though it was much slower. Faster than walking.
amidoingitright?
Vittoria airliner is much more protective. Cushcore is designed as a suspension device.
I know inserts work well for some riders on some trails, but it DEFINITELY shouldn't be a "go to" product to install if you're dinging rims on a regular basis. It should be seen as a solution, not an upgrade, and the penalties are significant enough to not install one as a preemptive measure for most riders from the get go.
If you never ridden a carbon wheel you can't say they are only lighter. It is more then that. Easily to build up and true, oblivious. The feeling of thestiffness is so much better.
That said I smacked my carbonara rim after 5minutes...
Every action has an equal and opposite reaction right? The action is pressing into the jump face, like a spring coiling. The reaction is getting lots of "pop" and clearing jumps with no problem. It's all about the preload my friend. Like a trampoline.
I'm amazed how slow I can clear some tabletops now that I'd case going mach speed before. Once it clicks jumps are so much more fun.
Another tip for beginner riders, don't watch to youtube "how to" videos! I see so many new riders getting into all sorts of trouble because they watched a f*cking GMBN video telling them to bunnyhop off a lip! Just go out and practise, or even better, go with a more experienced rider who can watch what you do and help point out any issues etc...
It’s really important to differentiate between tire inserts that protect rims, and those that actually improve tire damping, reduce compression & rebound spikes, and support corner knobs.
I would agree if the recommendation were about tire inserts, but CushCore is different.
A few simple Google searches later:
Cushcore 29er-250g (2 inserts+valves=$210CAD)
Rimpact Pro 29er-160g (2 inserts+ valves was $150CAD shipped for me)
Panzer 29er-115g( price for 2 inserts+valves+sealant seems to be around $175CAD shipped)
I have the Rimpact Pros. My buddy has Cushcore. The only noticeable difference is the thicker foam density of the Cushcore. You can run slightly lower pressures (depending in your weight/ riding style) with Cush vs Rimpact. Aside from that, they both decrease tire roll, increase sidewall support, and protect your rim well. Can't speak on the Panzer.
I suppose price is also objective. Sorry I wasn’t cleared. To be clear: I do not care about pricing. I want data on performance.
I would gladly bet against you on this one.
If, however, others can achieve similar damping results, I’m all for it. Innovation and competition are good things because yeah, CC is pretty pricey for some well-shaped, fancy foam.
But what about the weight factor? 100g less in each wheel of unsprung mass and rotational weight would theoretically lead to suspension gains. But is it really enough for us notice in a blind test?
Yep, just checked them, still the same 2-4mm thick tire "liner" sitting in the corner waiting to be thrown out.
No more foam characteristics and let's just forget that "you can ride home with a flat" claim.
They were already on the way when I read on their faq page that once installed the tires need to be deflated every day to avoid the squashing.
One of the worst mtb product I ever purchased. Sorry to break it to you.
The faq I see is as follows:
"The armour will compress some after it’s installed depending on the pressure of the tire. The higher the psi the more condensed the Armour will become. If you wish to keep the Armour as thick as possible then maintain a lower psi. You may also deflate your tire if you’re not going to be riding for a longer period. This allows the Armour to rebound back to its original size."
tannusamerica.com/pages/tannus-faq
If you feel like you were shafted, email our UK guys at Tannus.com and they'll get you sorted!
But there is a much better insert that does prevent tire sharts (they don't burp, they sound like a fart and there is a liquid mess), rim dings, and are very light weight - the NukeProof Advanced Rim Defence (A.R.D). These are awesome, I have them in two sets of wheels. www.pinkbike.com/news/first-look-nukeproof-adr-tire-inserts.html
I know that Vittoria and a couple of other companies have similar products, but at $35 from Chain Reaction, you can't beat the setup, price, and value. And they come with the tubeless valves too.
Must be nice to be able to ride so much that you wear out tires in a matter of weeks!
The CushCore I purchased were bought and first installed in their Bend, OR office. Nice folks, a great idea for motorcycles, but ridiculous for everyday trail riders.
BTW - the only reason I have so many wheels is two spacing standards (boost and non-boost) and slow arrival of warranty parts. It does give me a good test/check of parts to compare. I ride XXL frames because of my size, and I break stuff regularly. My newest bike, a 2019 model, has every part except the frame and headset either replaced or modified because of wear and damage.
Not a big SRAM guy, but very often have friends asking me if the SX/NX price jump is worthwhile. Is it just another weight penalty, or are there significant performance factors? Personal opinions? I know deore to SLX has some significant advantages (like hollowtech cranks) but finding clear info on the new quietly released SRAM stuff was a little tricky.
Just a thought.
...is presumably a saying simewhere.
2000 is 68 too slack? yes
2010: is 64? yes
2020 : is 58 too slack? yes
Put in more air & less likely to need them in the first place?
Light, cheap, easy to install.
I dont see that big a difference in weight - I usually run the continental light tubes which were under 130g on my scale- where the allocated amount of sealant plus the valve stems was close to 100 when I weighed it. Only way I can see people saving over a pound is if they were using heavy dh tubes......
just made up a carbon wheel so I can run modern tire pressures and not end up with an octogon wheel after three rides. Heavy casing over inserts any day, too.
this is the current program, and it's orders of magnitude better than tubes.
But the things I’ve heard you say are so wrong that i just can’t.
And I’m just the guy trying To help people ignore your kind of advice.
Anyway I haven’t yet said anything about them making quality parts.
But yes, some of their parts are as high quality as our worlds manufacturing situation allows. Ever looked at an xo1 eagle cassette? It’s pretty obvious that that’s a high quality product. They last ages.
I’m not gonna say the same about an NX cassette.
But pinkbike will!
And you being unable to speak directly about any clear points I can make puts you in what category?
Slanderous shit talker?
Torque caps are great. Similar to why buildings are wider at the bottom than the top.
And the people having trouble with tubeless are doing it wrong in many different ways.
Sorry you haven’t figured it out yet.
Thankfully there are easier sports for you to blunder through though maybe try pickle ball?
Mountain biking is 100% without a doubt too advanced of a sport for you to comprehend. I think competitive checkers is more your speed, but even that might be too advanced for you. Maybe competitive go fish is the right speed for you.
Yet strangely all sorts of people manage to go mountain biking with Sram components and have a great time doing so.
Maybe your focusing on the all of the wrong things. Maybe your irrational inability to see beyond a brand situation to the human issue that affects all brands everywhere in many different ways is some evidence of a bigger problem you have.
But even if it isn’t.
You are still the guy who can’t figure out tubeless.