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For cyclists looking for the best of both worlds, the new 2x12 RX820 UNDROPPABLE drivetrain—featuring the Shimano GRX RD-RX820 2x12V Rear Derailleur paired with an 11-34T or 11-36T cassette and 48/31T front chainrings—is the optimal solution for Gravel riding. This setup offers an ultra-wide gear range to maintain a comfortable cadence whether riding on flat terrain, over rough ground, or tackling a steep off-road climb.
The Shimano GRX RD-RX820 2x12V rear derailleur, with its precise shifting, incorporates the integrated SHADOW RD+ chain stabilizer to provide maximum drivetrain security on uneven terrain. It keeps the rear cassette’s gear steps tighter, ideal for subtle cadence changes during competitive races and energetic weekend group rides. The 2x12 configuration fits most 700c wheels perfectly thanks to the proven efficiency of the HG core body design.
RD-RX820 - Rear Derailleur
12-speed
Chain Stabilizer
Shimano SHADOW RD+
Maximum Cassette Range: 36T
Weight: 270 grams
