SRAM Red DUB 1x 12 Speed Aero ChainsetA single-ring crankset for the speed-focused triathlete and time trialist, this Aero-centric model by SRAM meets the simple demands of the modern racer. Aerodynamic, durable and easy-functioning, it features X-Sync chainring technology for superior chain control and a DUB bottom bracket for longevity and common compatibility. Suitable for use with power meters, improving your performance is at the essence of this superb set. Features: Chainring Material: Aluminium Crankarm Material: Carbon Speed: 12 speed Bottom Bracket Compatibility: All SRAM Road DUB BBs Chainline: 45mm Bottom Bracket Spindle Interface: DUB Bolt Circle Diameter: 107mm Mount Type: Direct Mount Bottom Bracket not included Buy SRAM Components from Chain Reaction Cycles, the World's Largest Online Bike Store.