Tiagra FC-4700 Cranksets Aluminum construction with anodized finish. 43.5mm chain line, 110mm BCD, 150 Q-factor. Crankset with integrated 24mm axle decreases weight and improves rigidity. Item Specifications: Color: Gray, Spindle Interface Type: Hollowtech II, Pedal Spindle: 9/16", Chainring BCD: 110 Asymmetric, Rings: 50/34, BB Included: No, Crank Intended Use: Road, Defined Color: Gray, Crank Length (mm): 170, Drivetrain Speeds: 10, Number of Chainrings: Double, Chainline/Hub Compatibility: 130 Hubs, Chainline/Hub Compatibility: 135/142 Road Disc Hubs > 415 mm Chainstay,