Like Andrea, some of my parts can go forever--one being my legs. Butt callouses are fine, too. I think it's the upper body and neck that wouldn't last--but that's a bike fit issue, I think.

My question is how long do I put up with this bike before I can justify a new one for longer distances???

I'm not really "putting up" with it, that much. I have a steel beauty on the rack waiting for more love and attention, and that one will fit me better. I'll probably do my first century on her--the Centurion.

Karen