GRX Di2 RX815 Rear Derailleur 11 Speed (Short Cage)

Explore beyond!
Discover the almost endless possibilities of modern road cycling with SHIMANO GRX components. The RX800 Series at Ultegra/XT level represents the performance-oriented top range of Shimano’s gravel- and cross-specific GRX groupsets.

With the electronic GRX Di2 RX815 11-speed rear derailleur at Ultegra level, the Japanese bike industry giant launches the first gravel-specific shifting system for your gravel racer. For this, the clever developers at SHIMANO have used the long proven Shadow RD+ technology from the mountain bike sector, featuring a friction damper that slows down the forward and backward movement of the RD-RX815 Di2 rear derailleur. This significantly reduces the risk of chain bouncing and jump off and shifting into the wrong gear, while significantly reducing chain noise. This guarantees silent, smooth, precise and reliable electronic gear changes in challenging terrain. Whether riding off tarmac roads and on dusty gravel roads, going on a bikepacking adventure with lots of luggage, doing classic cyclocross or simply commuting to work.

The GRX Di2 RD-RX815 rear derailleur with a short cage is designed for all single and double chainring drivetrains including 11-speed SHIMANO road cassettes with 11-30, 11-32 or 11-34 teeth.

Details:
Di2: electronic SHIMANO shifting system
Shadow RD+ technology (friction damper)
Gravel-tuned clutch tension
Silent, smooth and reliable shifting on rough terrain
4 PTFE coated pins

Specs:
Material: fibreglass reinforced plastic, aluminium
Compatibility: Di2 11-speed
Short cage
Largest sprocket max.: 34 teeth
Largest sprocket min.: 30 teeth
Smallest sprocket max.: 11 teeth
Smallest sprocket min.: 11 teeth
Max. front difference: 17 teeth
Total capacity: 40 teeth
1 E-Tube port
Weight: approx. 288 g

Recommended cassette:
Ultegra CS-R8000 11-speed cassette (product code: 2260392)
CS-HG800 11-speed 11-34t cassette (product code: 2260393)
Recommended chain:  
Ultegra/XT CN-HG701 HG-X 11 Speed (product code: 2234416)

In the box:
1x SHIMANO GRX Di2 RD-RX815 rear derailleur