The Shimano GRX FC-RX810 features optimum gearing for mixed terrain and riding styles, and is designed for use with GRX Di2 components.2x11 speed crankset features gravel-specific gear rations that preserve riding rhythm over rough surfaces with wider tires. Includes a 17t front range for wider gearing possibilities. 46.9mm chainline / 151mm Q-factor. Item Specifications: Pedal Spindle, 9/16", BB Included, No, Chainring BCD, 110,80, Color, Black, Defined Color, Black, Crank Intended Use, Gravel, Number of Chainrings, Double, Crank Length (mm), 170mm, Rings, 48/31, Drivetrain Speeds, 11, Spindle Interface Type, Shimano Hollowtech II, Weight, 722, Chainline/Hub Compatibility, 135/142 Road Disc Hubs > 415 mm Chainstay,.