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 switchFast and reliable shifting on rough terrainAdjustable chain stabilizer prevents chain slapSHIMANO SHADOW RD+Gravel-tuned clutch tensionSwitch stabilizer ON/OFF to match terrain: ON for gravel, OFF for smooth roadsLED status indicatorBattery indicator, pairing, adjust mode, etc.Top sprocket: Max. 11T/Min. 11TLow sprocket: Max. 36T/Min. 34TTotal capacity: 40T