The Shimano GRX RD-RX815 Di2 rear derailleur delivers professional-grade electronic shifting for gravel and mixed-terrain riding. It features an integrated chain stabilizer with an ON/OFF switch, allowing riders to eliminate chain slap on rough trails or reduce friction on smooth pavement. This Di2 version ensures digital precision and effortless synchronization with Shimano's electronic road levers.

Optimized for versatility, this derailleur is compatible with road cassettes featuring a max low cog of 34T. It offers a total capacity of 38T and handles a maximum front chainring difference of 17T, making it ideal for 2x drivetrains. The gravel-tuned architecture provides security and crisp gear changes in the most demanding off-road conditions.

Quick Facts

Feature	Specification
Drivetrain Type	Di2 Electronic (11-Speed)
Clutch System	Adjustable Shadow RD+ (ON/OFF Switch)
Cassette Range	11-30T to 11-34T
Total Capacity	38T
Max Front Difference	17T
Compatibility	Shimano Di2 Road Dual Control Levers