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

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.
Compatible with 11-34T and 11-36T 12-speed cassettes
Supports Full or Semi-Synchronized shift modes, enhancing rider customization
Rear Speeds: 12
Top Sprocket: Max. 11T/Min. 11T
Low Sprocket: Max. 36T/Min. 34T
Total Capacity: 40T
Max Front Difference: 17T
Pulleys: sealed bearing
Charging cable: EW-EC300
Mount: Direct attachment (conventional)
Weight: 310g.
Color: Black