Originally Posted by
SoSmellyAir
How are TPU tubes for rolling resistance compared to their ~ 100 g butyl counterparts? (That is another 120 g weight reduction there for the pair, comparable to going from alloy to CF handlebar.)
TPU tubes appear to be better than lightweight butyl tubes in terms of Crr, but the best latex tubes are still better than that. However, TPU tubes are lighter than latex, and hold air longer. They're also (currently) more expensive than latex.
Some tubeless tires have lower Crr than their equivalent "tubed" version with a latex tube.
Old-style tubulars with latex inner tubes (not all tubulars did) can have very low Crr, and the combined wheel/tire can be lower. Most of them have worse aero, but that's not so much of an issue for hill-climbing.