Campagnolo Chorus 11 Ultra-Torque Carbon Crankset Arm Material: carbon fiberArm Length: 170 mm, 172.5 mm, 175 mmBottom Bracket: not includedBB Type: Campagnolo Ultra-TorqueBB Threading: Bolts: Rings: 2Spindle: Compatible Components: Campagnolo 11-speed drivetrainsWeight: 663 gRecommended Use: training, racingManufacturer Warranty: Bolt Circle Diameter: 135 mmChainring Sizes: