Find your Shimano components for electronic drivetrains at Escapa.
The Shimano GRX Di2 RD-RX825 2x12-speed rear derailleur offers ultra-fast yet precise shifting. Even under medium to high loads, thanks to Shimano Shadow RD+ technology, shifts are fast and quiet, even on rough Gravel trails.
Thanks to its compatibility with cassettes up to 36 teeth, the Shimano GRX Di2 RD-RX825 Rear Derailleur for Gravel bikes is also suitable for the most demanding climbs.
With a chainring combination optimized for Gravel riding—48/31 or 46/30 up front—paired with an 11-34 or 11-36 cassette, this drivetrain offers an extremely wide gear range so you can ride at a comfortable cadence whether you’re on flat terrain, trails with ascents and descents, or tackling tough climbs.
Welcome to Di2
Experience legendary precision. Customize your ride with the E-TUBE PROJECT Cyclist app. Choose your shifting speed, assign shift buttons to specific functions, and program shifting modes—such as synchronized and semi-synchronized shifts—so you can keep your full attention on the gravel ahead.
Features
Quiet and reliable rear shifting on rough terrain
The adjustable chain stabilizer prevents the chain from knocking and skipping Shimano SHADOW RD+
Smooth and reliable shifting in changing terrain conditions
ON-OFF switch for the stabilizer to adapt to the terrain
Compact design with an integrated unit for wireless signal transmission, charger, and switch LED status indicator
Battery indicator
Use: Gravel, Cyclocross
Mounting: Direct mount (conventional)
Technology: Shadow RD
Compatible with front derailleurs: 2x
Rear derailleur: 12-speed
Compatible chain: 12-speed HG
Max. Large sprocket teeth: 36 teeth
Min. large sprocket teeth: 34 teeth
Maximum small sprocket teeth: 11 teeth
Maximum front sprocket teeth: 17
Total capacity: 42 teeth
Compatible power cable: EW-SD300
E-tube Project Firmware Update: Yes
Di2 wireless chip: Yes
