I originally had FSA K-force cranks and carbon seat post on this beauty. The seatpost was 4in. in the frame and it still broke completely off. (no warranty on their posts by the way). The cranks on the other hand lasted a little longer, but the insert inside the carbon broke loose giving the cranks the sensation that they were loose. FSA did on the other hand warranty the cranks after about 3 weeks. The good thing about this was I got re-aquainted with my ole' friend "Yo Eddy" and I got some ole' faithful parts. Thompson seatpost and XTR cranks. In yer face Full Speed Ahead.