Shimano GRX RD-RX815 Di2 Rear Derailleur

With an integrated chain stabilizer mechanism, the Shimano GRX derailleur provides a quieter experience along with shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain stabilizer. The RD-RX815 Di2 version offers the digital precision of Shimano electronic shifting with synchronization and is compatible with road cassettes with a max cog size of 34T.

- Adjustable, gravel-tuned chain stabilizer prevents chain slapping and drops
- Switch stabilizer ON/OFF to match the terrain
- Total capacity: 38T
- Smooth and reliable mixed surface shifting