“Changed my roadie from butyl tubes to TPU recently, price difference not so big a deal these days so thought I’d give them a go. Any doubts I had are gone. These tubes ‘feel’ faster. Yes I have set lots of new PBs on short sections, overall speed about the same. My guess is that these spin up to speed faster with lower rolling resistance. I feel I can hold flat speed longer, go uphill in a higher gear ratio. Longer PBs set on butyl tubes might still be hard to beat (but hey, I was way younger and fitter back then). One tube did go flat overnight which had me worried I got a pinch flat, but I checked the tube and it’s fine. Reinstalled carefully and put extra tape around the valve hole just in case. All good now. Maybe the valve wasn’t screwed in tight. One more thing… my tool bag is so light I just chuck it in my jersey pocket, no worries!”
