DJR Posted September 2, 2018 Posted September 2, 2018 I had a concern about a 23mm tube to be fitted in a 25mm tyre. The max size for the Michelin Latex tubes is 23mm yet there seems to be a move towards wider tyres and I am running a 25mm tyre on my rear wheel. I did a little research and found that some people actually recommend using the slightly narrower tubes compared to the tyre size. https://weightweenies.starbike.com/forum/viewtopic.php?t=119073 Any advice or experience in this regard?I often do this and have never had any problems with it. If anything, I find fitting the tubes and tyres easier because it is less likely to pinch the tube when seating the tyre bead. Once pumped up I find no difference in ride feel or puncture resistance.
Li Mu Bai Posted September 2, 2018 Posted September 2, 2018 I have noticed that SA bike shops seem to only stock regular tubes. It seems like there are a lot more options available from international online vendors. Within the Continental range there are a few different specs. Some reviews have stated that the Continental Race 28 Supersonic is the cheapest and easiest way to reduce the total weight of a bike by 100g and, considering this weight is on the extremity of the wheels, it should make for a significant improvement in acceleration too. What are the pros and cons of lightweight tubes?Very easy to pinch and pop the thinner light weight tube when installing it. not worth the extra expense imho. Give your nose a good blow, or take 5 mins extra on the jazz, to make up the weight difference...
Li Mu Bai Posted September 2, 2018 Posted September 2, 2018 Thanks for all the responses... As usual, this has taken me down the Rabbit hole of more options and questions rather than clearing things up. What I have taken from this thread and some further research is the following... Weight saving for 2x Race 28 Supersonic tubes vs normal race 28 Tubes is 110 g (Continental website). Price difference from CRC as an example for 2 tubes is R 178.00 (Comparing 60mm valve option). Tubbies would cost approx. R15000 including 2 tyres for a saving of 530g. So, there is a big weight saving to be made with tubbies, for a significantly higher price. Similarly for seat posts and handle bars and saddles, (although these weights are not rotating so the effect is perhaps less pronounced...?) The value proposition for TuboLito Tubes is an interesting one since the puncture resistance is unquantified as yet. If they are as good as they claim to be, they could be worth it. Looking at CWC prices for Tubolito, they come in at about 3x the price of Race 28 Supersonic tubes from CRC (Estimated including Delivery and duties). So they basically need to last 3 times longer to make them worthwhile. (not taking the weight saving into account) As for having a good crap... I can go lightweight on the tubes and still have a good crap... Aero is more important than weight.
Shebeen Posted September 2, 2018 Posted September 2, 2018 Rookie question... How does the varying inner tubes affect rolling resistance? Surely that's 99% down to the actual tire and the pressure in it?
DieselnDust Posted September 2, 2018 Posted September 2, 2018 Varying inner tubes? What is that? If you mean various types I e. Butyl vs latex then it's simply a matter of hysteresis. A thin elastic wall is able to respond faster to impact and allow conformance to the surface. Tyre + tube wall thickness and elasticity being the deciding factors here
DJR Posted September 2, 2018 Posted September 2, 2018 Rookie question... ...... Rookie question from you Just kidding
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