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Your cart is empty.The FC-RX610 crank balances weight savings, optimized efficiency and an array of gearing options that cater to the segmented demands of mixed-terrain riding. Riders can choose closer gear steps or ultimate range depending on personal need by pairing a 10-45t or 10-51t cassette with 38t or 40t chainring (cassettes and 38t chainring sold separately). Optimal gearing for mixed-terrain riding. Compatible with HG 12-speed chains. 49.7mm chainline. 151mm Q-factor. Item Specifications: Color: Black, Rings: 40, Number of Chainrings: Single, Crank Length (mm): 170, Crank Intended Use: Gravel, Drivetrain Speeds: 12, Weight: 812, BB Included: No, Pedal Spindle: 9/16", Spindle Interface Type: Hollowtech II, Chainring BCD: 110 Asymmetric, Chainline/Hub Compatibility: 135/142 Road Disc Hubs > 415 mm Chainstay, Defined Color: Black,