SHIMANO's GRX 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.
- Compact design with integrated wireless unit, charging port, and switch
- Fast and reliable shifting on rough terrain
- Adjustable chain stabilizer prevents chain slap
- SHIMANO SHADOW RD+
- Gravel-tuned clutch tension
- Switch stabilizer ON/OFF to match terrain: ON for gravel, OFF for smooth roads
- LED status indicator
- Battery indicator, pairing, adjust mode, etc.
- Max. front difference: 17T
- Total capacity: 40T
- Low sprocket: Max.: 36T, Min.: 34T
- Top sprocket: Max.: 11T, Min.: 11T
- Pulley: Guide pulley bearing
- Teeth: 11/13T
- Di2 connectivity wired
- Di2 shifting
- Bluetooth® LE custom (*1)|Adjust mode information
- Bluetooth® LE custom (*1)|Di2 battery level
- Bluetooth® LE custom (*1)|Gear position
- Bluetooth® LE custom (*1)|SHIMANO E-BIKE SYSTEMS data items (*3)
- Bluetooth® LE custom (*1)|Compatible with E-TUBE RIDE
- Bluetooth® LE custom (*1)|Compatible with E-TUBE PROJECT
- ANT private (*2)|Adjust mode information
- ANT private (*2)|Di2 battery level
- ANT private (*2)|Gear position
- ANT private (*2)|SHIMANO E-BIKE SYSTEMS data items (*3)
- Firmware update by E-TUBE PROJECT
- SD300 port
- LED for system status
- Charging cable: EW-EC300
