The Shimano GRX Di2 FD-RX815-F Front Derailleur is designed for riding on rough road and provides for ultra-smooth shifting by flawlessly moving your chain up and down your crankset without extra effort. The result is a shift that is precise and direct with no delay. The GRX Di2 Front Derailleur benefits with lighter front shifting wider tire clearance wider range front gearing and precise electronic shifting. Operates with Shimano Di2 for digital electronic shifting Chainline is increased by 2.5mm over conventional front derailleurs for greater tire clearance in the front 17t front range provides more gear range in the front Wider tire clearance Wider range front gearing