SRAM Truvativ X0 Bb30 10S 170 Red Am 38.24 Wheel Unidirectional carbon fiber arm mated to a 4-arm spider with insert-molded aluminum pedal and spindle-interface reinforcements Optimized q-factor with a 49.5mm chain line Taper-machined, hard-anodized 7075-t6 aluminum rings with optimized X-GLIDE shift pins/ramps The XO 2x10 carbon crankset requires a SRAM GXP Team or GXP ceramic bottom bracket, sold separately