The 105 FC-RS510 crankset features a 2-piece design and is compatible modern disc brake road frames. 4-arm crankset for 11-speed drive train. Compatible with frames of O.L.D. 135 mm and 410 mm chainstay length. 43.5mm chainline. Item Specifications: Color: Black, Rings: 50/34, Number of Chainrings: Double, Crank Length (mm): 175, Crank Intended Use: Road, Drivetrain Speeds: 11, BB Included: No, Pedal Spindle: 9/16", Spindle Interface Type: Hollowtech II, Chainring BCD: 110 Asymmetric, Chainline/Hub Compatibility: 135/142 Road Disc Hubs