Campagnolo CPY S Record UT 11S Crankset Arm Material: carbon Arm Length: 170 mm, 172.5 mm, 175 mm Chainring Sizes: 53 / 39 t, 52 / 36 t, 50 / 34 t Bolt Circle Diameter: 112 mm, 145 mm Bottom Bracket: Campagnolo Ultra-Torque