Hollow-forged aluminum arm mated to a 4-arm forged aluminum spider Optimized Q-factor with a 49.5mm chainline and a drive-side integrated GXP (Giga X Pipe) 24mm, or non-drive integrated BB30 30mm bottom bracket spindle for maximized stiffness GXP Team cartridge bearing bottom bracket included for 68/73mm threaded shells (can be upgraded to BlackBox ceramic bearings or BB92 Press-Fit with separate bottom brackets) BB30 steel cartridge bearing set included for 68/73mm shells (can be upgraded to BlackBox ceramic bearings or PF30 Press-Fit with separate bottom brackets) X-Glide chainring combinations engineered with 13/14t common-denominators enabling perfectly timed/placed shift-points Taper-machined 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 840g (GXP) / 785g (BB30)