Originally Posted by
DorkDisk
It seems like you ran into a chainline issue (road double [43.5mm] vs MTB triple [47.5mm]). Basically, your 50t is roughly where your middle ring is now.
These modern road cranksets from Shimano, SRAM, and Campagnolo are not meant to run shims on the BB, there is no chainline adjustment. GXP especially uses a stepped down spindle which requires a specific distance for preload; unless the shell is way out of spec, BB shims are not used on road cranks.
It looks like a Shimano Hollowtech II 50/34 fits.
I got Fsa Tempo Adventure square tapered crankset. That way it gives me more chain line adjustment. What do you think about using that with SRAM apex 10s?