The GRX FC-RX810-1 crankset is designed to handle different types of terrain and riding styles. They offer a better chain line and more clearance for the rear tire (+2.5mm). The mono version offers a simplified drivetrain (RX800/600 > sprocket set up to 40 teeth, RX800 > sprocket set up to 42 teeth) and features an improved tooth profile (Dynamic Chain Engagement) for better chain retention on rough terrain.These components inherit the Shimano technologies developed on road and MTB drivetrains to offer precise and smooth shifting. With the GRX series, the result is a smooth and quiet drivetrain that is specifically designed for gravel ridingDetails:Center distance: 110 mm.11-speed compatible.Aluminum construction.Chain line: 50.1 mmQ-Factor: 151 mmCrank length 172.5 Material Aluminum Number of chainrings 1 Bottom bracket axle 24 mm Crankset standard Shimano Hollowtech II Chainring teeth 40 Gearbox Included No Speed 11 Q-factor 151