Shimano GRX Di2 RD-RX825

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 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. Attributes Max Front Difference 17T Maximum Cog 36T Minimum Cog 11T Primary Color Black Cage GS RD Capacity 40T RD Spring Type Shadow Plus Speed 12 Mount Standard