Hi all, I completed a 100km charity run recently and felt fine apart from a sore backside! I was suprised that my legs were okay as the furthest I'd cycled before that was about 50km but that was maybe 2 to 3 times a week to build my basic fitness. Anyway I'm doing another 100km charity ride next saturday and was wondering whether a carbon seatpost would be more comfortable, my local bike shop said it would absorb more vibrations but i'm don't want to shell out 80 odd pounds if it doesn't help! I ride a hybrid (Giant crs 0) and wondered if anyone has changed their alu stem for a carbon one and if it makes any difference? Thanks.