Thanks for the responses. I’m asking because I went back to a HT recently, which I always believed to be the fastest, and my back couldn’t take it. Does a 29er HT have noticably more ‘give’?
Sounds to me like someone asking for help with new bike justification 😉
29er tyres: Bigger air volume for the same tyre size, so, effectively, yes – a bit more comfort.
29er frame: Nothing inherently more forgiving about a 29er frame than a 26er. However, some carbon frames around (mostly 29er) with some give engineered into the back end.
Is the backache definitely from the bumpiness though? I get backache on the HT from pushing a harder gear (the FS tends to make me spin easier gears)