The Shimano GRX FC-RX810 features optimum gearing for mixed terrain and riding styles, and is designed for use with GRX Di2 components. FEATURES : 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 SPECS : Number of Chainrings: Double Chainline/Hub Compatibility: 135/142 Road Disc Hubs > 415 mm Chainstay Spindle Interface Type: Shimano Hollowtech II Chainring BCD: 110 , 80 Crank Length (mm): 172.5 Pedal Spindle: 9/16" Crank Intended Use: Gravel Rings: 48/31 Drivetrain Speeds: 11 Weight: 722 BB Included: No