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 chainline and a drive-side integrated GXP (24mm) or BB30 (30mm) bottom bracket spindle for maximized stiffness *GXP (Giga X Pipe) cartridge bearing bottom bracket set sold separately: available in 68/73mm threaded or BB92 Press-Fit (either BlackBox ceramic or Team steel bearings) *BB30 cartridge bearing bottom bracket set sold separately: available in BB30 or PF30 (either BlackBox ceramic or Team steel bearings) X-Glide chainring combinations engineered with 13/14t common-denominators enabling perfectly timed/placed shift-points Taper-machined 7mm hard-anodized aluminum rings with optimized X-Glide shift pins/ramps, dual-hex chainring bolts, alloy M10/M15 self-extractor crank/spindle bolt, and pedal washers 790g (GXP) / 735g (BB30)