Shimano’s GRX RX825 Di2 12-speed rear derailleur features a built-in wireless connectivity unit and charging port, ensuring fast and reliable shifting for mixed-terrain riding and easy recharging. Integrated Shadow RD+ technology prevents chain slap and ensures precise shifting even on rough terrain. Thanks to built-in ON/OFF switch, wheel removal is easy too. The RD-RX825 is compatible with 11-34t and 11-36t 12-speed cassettes and supports Full or Semi-Synchronized shift modes, enhancing rider customization.
- Integrated wireless unit, charging port, and switch allows a compact design
- Offers fast and reliable shifting on rough terrain
- Adjustable chain stabilizer prevents chain slap
- Shimano Shadow RD+ offers a quiter drivetrain by utilizes a stablizer to reduce chain slap and provides a simple solution for chain drops
- Gravel-tuned clutch tension features a switch stabilizer ON/OFF to match terrain – ON for gravel, OFF for smooth roads
- LED status indicator to easier identify battery life, pairing, adjust mode, etc.
- Top sprocket: Max. 11t/Min. 11t
- Low sprocket: Max. 36t/Min. 34t
- Total Capacity: 40t
| Item Specifications |
| Cage Length |
Long |
| Chain Wrap Capacity (teeth) |
40 |
| Color |
Black |
| Drivetrain Speeds |
12 |
| Largest Cog |
36 |
| Rear Der/Shifter Compatibility |
Shimano Road Di2 |
| Rear Derailleur Mount Type |
10×1 Standard |
| Rear Derailleur Mount Type |
Shimano Rear Direct Mount |
Shimano GRX RD-RX825 Di2 Rear Derailleur Rear Derailleur UPC: 192790310893
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