Shimano GRX Di2 RD-RX815 Rear Derailleur (Black) (11 Speed) (Long Cage) (Shadow Plus) (Electronic)

The Shimano GRX Di2 RD-RX815 rear derailleur features an integrated chain stabilizer to keep the shifting smooth and precise over a variety of terrain.

Features:

• SEIS (Shimano Electronic Intelligent System)
• Adjustable chain stabilizer prevents chain slapping and drops
• Switch stabilizer ON/OFF to match the terrain
• Gravel-tuned clutch tension

Specifications:
Speed: 11 Speed
Shifter Compatibility: Shimano Di2
Shift Mechanism: Electronic (Wired)
Max. Tooth: 34T
Min. Tooth: 11T
Chain Wrap Capacity: 38T
Cage Material: Carbon/Aluminum
Chain Retention: Shadow Plus
Color: Black
Weight: 287g

This product is expected to become available for purchase on Tuesday, July 14, 2026