Campagnolo Chorus 12-Speed Crankset Sing The Chorus Your crankset is what helps translate your pedaling power to your rear wheel. With a stiff crankset, more of your power will go to the rear wheel. The Campagnolo Chorus 12-Speed Crankset has unidirectional construction technology and is produced directly molded without any surface coating. It is versatile thanks to its new ring of 123mm bolts that, while giving it an extreme performance structure, also ensures a wider variety of use segments. Features Unidirectional carbon fiber cranks with a steel axle and aluminum chainrings Good stiffness and optimum power transmission Weight: 728g (172. 5 with 32/48T)SPECIFICATIONSSpeeds12-Speed BB Compatibility-Chain Ring32/48T, 34/50T, 36/52TCrank Arm Length165, 170, 172. 5, 175mm BB Spindle Interface-Chainring Material Aluminum Bolt Center Diameter (BCD)123mm Crank Arm Material Carbon Fiber Chainline-Bottom Bracket Included No Intended Use Road Weight728g (172. 5 with 32/48T) | Campagnolo | Chorus 12 Speed Crankset 170Mm, 48/32T