Shimano’s GRX RX825 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.

– Integrated wireless unit, charging port, and switch allows a compact design
– Offers fast and reliable shifting on rough terrain
– Adjustable chain stabilizer prevents chain slap
– Shimano Shadow RD+ offers a quiter drivetrain by utilizes a stablizer to reduce chain slap and provides a simple solution for chain drops
– Gravel-tuned clutch tension features a switch stabilizer ON/OFF to match terrain – ON for gravel, OFF for smooth roads
– LED status indicator to easier identify battery life, pairing, adjust mode, etc.
– Top sprocket: Max. 11t/Min. 11t
– Low sprocket: Max. 36t/Min. 34t
– Total Capacity: 40t