With components specifically designed for 1x12-speed drivetrain systems, the GRX series is celebrating its debut in the completely wireless shifting segment. The focus is on the RD-RX827 rear derailleur, which is based on the wireless models of the XTR M9250 series. The 1-speed concept is complemented by the BL-RX825 brake lever and the WH-RX810 wheels. Equipped like this, gravel athletes can experience what ultimate reliability means on any terrain – whether racing, back-roading on remote trails or on your next all-day adventure.

The all-new GRX RX827 rear derailleur paired with a 10-51T cassette gives riders and racers the speed, range, and robustness to pursue any gravel challenge. With built-in automatic impact recovery, an impact-deflecting shape, and solid pulleys, this derailleur stands up to hard impacts and still retains its lightning-quick shifting performance.

Specifications
Fully wireless shifting built for rough gravel terrain
Robust Design: A wide link structure, skid-plate design, durable aluminum plate and solid pulley add robustness and longevity.
RD Protection Function: The new Automatic Impact Recovery function instantly returns the derailleur to its original position after impact.
SHIMANO SHADOW ES: A slimmer, stronger evolution of SHIMANO's pioneering chain-stabilizing SHADOW RD+ concept.
Protected Battery: Tucked safely inside an enclosed space, the battery won't budge even in rough terrain, while remaining easily removable for charging.

Material: aluminum, plastic, cage: aluminum
Version: Di2 wireless, 1x12-speed, long cage
Shifter compatibility: Shimano GRX Di2 STI ST-RX825
Power supply: Shimano BT-DN320 battery
Total capacity: 41 teeth
max. largest sprocket: 51 teeth
min. largest sprocket: 51 teeth
max. smallest sprocket: 10 teeth
min. smallest sprocket: 10 teeth
Compatibility:
Shift Lever: St-Rx825, St-R9270, St-R8170, St-R7170
Cassette: CS-M9200, CS-M9100/M9101, CS-M8200, CS-M8100, CS-M7100, CS-M6100
Chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100

Whats in the Box
1 Rear Derailleur, "SGS" Version With Long Cage (Without Battery)

Mfr Claimed Weight
449g