TRP EVO Carbon Cranks Durable and Lightweight If you're looking to enhance your pedaling power, a carbon fiber crankset will help a lot. The TRP EVO Carbon Cranks feature a high-performance carbon layup crankarm construction for strength and weight savings and has a 30mm spindle to provide exceptional power transfer. It is designed to be used with frames that have 68mm or 73mm bottom bracket shells. Features High-performance carbon layup provides strength and weight savings30mm spindle diameter is torsionally rigid for exceptional power transfer For use with frames that have 68mm or 73mm bottom bracket shells Chainring and bottom bracket are sold separately SPECIFICATIONSSpeeds12-Speed BB Compatibility68/73mm Chain Ring Sold Separately (Direct Mount)Crank Arm Length165, 170mm BB Spindle Interface30mm Chainring Material-Bolt Center Diameter (BCD)-Crank Arm Material Carbon Fiber Chainline49/52mm Bottom Bracket Included No Intended Use Mountain Weight TBD | Trp | Evo Carbon Cranks | Black/gold | 165Mm