Shimano GRX FC-RX610-2 Crankset - 165mm, 12-Speed, 46/30t, 110/80 BCD, Hollowtech II Spindle Interface, BlackThe Shimano FC RX610 crank balances weight savings, optimized efficiency and an array of gearing options that cater to the segmented demands of mixed terrain riding. Product Specifics Color: Black Rings: 46 30 Number of Chainrings: Double Crank Length (mm): 165 Crank Intended Use: Gravel Drivetrain Speeds: 12 BB Included: No Pedal Spindle: 9 16" Spindle Interface Type: Shimano Hollowtech II Chainring BCD: 110 Shimano Asymmetric Chainring BCD: 80