Originally Posted by
Looigi
I guess it could be accidental that GXP cranks fit, but I think it's more likely that when designing the BB90 spec, they chose to allow it to accommodate GXP cranks.
Note I did point out in my earlier post that this was a Madone 6, but with SRAM cranks.
Quite right. The BB90 spec was developed expressly to accomodate all interations of external bearing cranks which have a long spindle...all Shimano sells. Trek didn't want to design a bike that couldn't mount Shimano cranks.