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