Wider tire clearance made possible by the +2.5mm chainline vs. conventional road front derailleurs Wider range front gear by utilizing a 17t front range FRONT SHIFT NEXT function for greater rider customization Conveniently compatible with Full, Semi-Synchronized shift modes Front Der/Shifter Compatibility: Shimano Road Di2 The Shimano GRX FD-RX825 Di2 Front Derailleur aids us in reaching our off-road goals by allowing us to fly down gravel roads with trustworthy front shifting, no matter how heavy the load. The wider 17t gear range and +2. 5mm chainline offer improved tire clearance for various tire choices, while the FRONT SHIFT NEXT functionality will enable us to customize our ride fully.