Tyre Liners, Gear Charts & Tough Carbon Wheels | GCN Tech Clinic
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Published 2024-06-26
00:00 Welcome to the GCN Tech Clinic #askgcntech
00:17 How tough are carbon wheels?
01:34 What tyres are best to use with TPU tubes?
02:52 How do I find the right gear?
04:01 Can you set up tubeless tyres without sealant?
05:43 Lubing waxed chains in an ultra long ride?
07:18 Do I decontaminate old chain wax to apply new wax?
08:28 Are 28mm tyres the ideal width?
09:52 Do tyre liners reduce power output?
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All Comments (21)
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Remember to use #askgcntech if you have any questions you want answered in the comments below💬
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I'm happy with a mechanical groupset, rim brakes, and tires with TPU inner tubes. It saves a lot of inconvenience.
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If you rode down the staircase of death and no one died, surely that means it wasn’t the staircase of death? Maybe just ‘stair case of a bit scary?
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Rim strength doesn’t prevent snake bite flats. That’s from running with the air pressure too low.
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I have have some carbon wheels for my fat bike that I took bike packing through Utah, Nevada, and California. Between myself, the bike and all the stuff it was right around 300 lbs and these took a beating without a complaint. 5 years later they're still true and roll great. The aluminum gravel bike wheels which have never had anywhere near that load have developed a wobble in front, these wheels also are a pain to get sealed tubeless I really regret getting these wheels.
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OMG I remember that carbon wheel test video. Kudos to Alex for having the courage! I almost couldn't watch 🤣
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Wax / Lube ? on a 600 k brevet there is typically an overnight stop where drop bags are. A prefixed chain with quick link "presto chango" is another option.
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Big fan of TPU tubes with 25mm German Conti clincher tyres. Sealant is great until a total failure where it's a messy pain.
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3 Tips For Crits. 1. WCS Ritchey Race Comp Slicks 25c 215 grams per Tyre. Ultra Grippy, On Par With Conti & Pirelli Tyres Excellent Rolling Resistance. 2. TPU inner Tubes 36Grams per tube like Olly said, dont bother with tubeless and sealant. The sealant will weigh more than the TPU inner tube. 3. Waxed Chain, BananaWax Drag & Friction Reduction Racing Chain Wax or Silca Secret Chain Wax or any Silca Wax is better than any oil. You want Lightness, and Reliability.
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I would say bring a Second waxed chain for the wax lube chain question
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Going for the next tougher 'type' of wheel (or other components) is a great strategy for people who are hard on gear and/or clydesdales. Gravel parts for road. MTB parts for gravel for example. As Ollie said, not usually as light but stronger.
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Re: car tyres being tubeless and not requiring sealant, I suspect they do actually slowly leak air, but: The pressure is half that of a bike tyre so slower/less leakage anyway. The circumference is a lot less so much less tyre/wheel interface over which to lose air. And finally, there's a comparatively huge volume of air in a car tyre, so a slow leakage can take months to become apparent.
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I don't fret over my chains. I waxed them once with hot melt when new and then used the drip on super secret whenever the mood hits. It doesn't bother me to run the chain dry for weeks at time. I do use a chain checker and when they reach that .7 mark I replace the chain with a new one. Chains are a cheap wear item IMO. What do I care about the noisy chain when other people's wheels are making so much racket you can't have a conversation.
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#askgcntech Pogacar has been using deep section Enve wheels and Vingegaard has been using the Cervelo aero frame with shallower wheels. Assuming both bikes weigh the same, which set up is likely to have better aerodynamics. All rounder frame with deep wheels or aero frame with shallow wheels.
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#askgcntech Any tricks or tips for keeping tan wall tires clean?
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I believe the tubeless setup that did not require sealant were UST wheels/tire. They had a specific bead/rim shape. I had UST wheels/tires on a couple of bikes. Rode hundreds of miles without sealant. Carried a tube. Shame that it did not become a standard.
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Drop the chain in hot water dry it off and drop it in the Silca Wax
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I’m not sure about the tire liners. The guys at bicycle rolling resistance seem to do a pretty good job with their testing and they couldn’t find any additional rolling resistance with the vittoria air liners.
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To further stress the argument made: Tubeless tires without sealant will probably not even work cause they lose air a lot… For example, I run Schwalbe Pro One‘s in the TLE version and they don’t hold any air without sealant. If you spray the sidewall with soapy mixture before putting the sealant, you can see bubbles popping out all over the sidewall!
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Strength of a wheel isn’t just in the material. It’s also spoke pattern. 1 cross, 2 cross, 3 cross, 4 cross differ in weight and strength. So if you see a competitive cyclist turn a wheel into rotini, check the spoke pattern before arriving at any conclusions. Quite often, those rims are minimally laced for weight savings.
