SHIMANO GRX RD-RX400 Long Cage Shadow Plus Rear Derailleur 10-Speed
The Shimano GRX FD-RX400 rear derailleur features an integrated chain stabilizer to keep the shifting smooth and precise over a variety of terrain.
Adjustable chain stabilizer prevents chain slapping and drops Switch stabilizer ON/OFF to match the terrain Gravel-tuned clutch tension Compatible only with 10-speed GRX 400 and Tiagra 4700 (not compatible with any other shifters) Direct Attachment