GRX RD-RX815 Di2 Rear DerailleurOperates with Shimano Di2 for digital electronic shifting Gravel-tuned clutch tension provides smooth and reliable mixed surface shifting
| Largest Cog | 34, 42 |
| Color | Black |
| Rear Der/Shifter Compatibility | Shimano Road Di2 |
| Rear Derailleur Mount Type | 10x1 Standard, Shimano Rear Direct Mount |
| Drivetrain Speeds | 11 |
| Weight | 287, 318 |
| Chain Wrap Capacity (teeth) | 31, 38 |
| Cage Length | Long |
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