Shimano FC-RS520 12 Speed Double ChainsetReady for wherever your next road journey takes you, this 12 speed chainset is part of Shimano's revolutionary R7100 series. Coming fully equipped for long days on the road, it features a two-piece crank design that uses an integrated 24mm bottom bracket and 2x12 speed 50-34T chainrings. Another benefit is its four-arm construction and compatibility with modern disc brake road frames, making it simple to integrate into your drivetrain setup for a performance upgrade.Features: Use: Road Speed: 12 speed Q-Factor: 150mm Chainline: 44.5mm PCD: 110mm Compatible Chain: HG 12 speed Tooth Count: 50/34T Number of Chainrings: 2 Recommended Bottom Bracket: Pressfit: BB-RS500-PB; Threaded: BB-RS501Technologies: - Affordable and high-end style crankset. - 4-arm crankset for 12 speed drivetrain. - Compatible with frames of O.L.D. 135mm and 410mm chainstay length. - 2-piece crankset. - Integrated crank arm and bottom bracket. - Increased rigidity with less weight. - Wider bearing positioning. - Rigidity is enhanced and pedalling force is efficiently transmitted. - Precision Bearings. - Low maintenance and simplified installation.Manufacturer's Part Numbers: 165mm: FCRS520A04 170mm: FCRS520C04 172.5mm: FCRS520D04 175mm: FCRS520E04A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.