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.
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.
Top sprocket: Max. 11T/Min. 11T
Low sprocket: Max. 36T/Min. 34T
Total capacity: 40T
