The SHIMANO GRX RX815 DI2 front derailleur delivers quick and smooth front shifting even under high pedaling torque. It's designed for a wider, 17T front range and it has programmed chain guide trim settings and can be used in full or semi SHIMANO SYNCHRONIZED SHIFT modes.

Specifications
Wider tire clearance
Chainline +2.5 mm vs. conventional road FD
Wider range front gearing
17T front range

Mfr Claimed Weight
TBC