Shimano GRX DI2 RD-RX815 Rear Derailluer 34T

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 and 2x drivetrains
- Operates with Shimano Di2 for digital electronic shifting
- Gravel-tuned clutch tension provides smooth and reliable mixed surface shifting