The 105 FC-RS510 crankset features a 2-piece design and is compatible modern disc brake road frames.Features-4-arm crankset for 11-speed drive train-Compatible with frames of O.L.D. 135 mm and 410 mm chainstay length-43.5mm chainlineItem Specifications-Color:Black-Rings:50/34-Number of Chainrings:Double-Crank Length (mm):172.5-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