Forged AL6061-T6 alloy 172.5mm crankarmsStamped and CNC machined AL6061-T6 alloy 2x chainrings in 50/34 or 53/39 tooth optionsGXP 22mm/24mm integrated spindle45.8mm chainline with thread-in GXP outboard bottom bracketBottom bracket not included172.5x50/34GXPBlack110x5B2x10/11UPC/EAN/GTIN: 888571120255