DI2 RD-RX817 Rear Derailleur 42T Shimano Grx

The Shimano GRX 11-speed Di2 rear derailleur integrates electronic shifting with silent and uninterrupted rear operation on rough terrain. An adjustable Shimano Shadow RD+ clutch prevents chain slapping and drops.

- For 1x drivetrains
- Operates with Shimano Di2 for digital electronic shifting
- Gravel-tuned clutch tension provides smooth and reliable mixed surface shifting