GRX 2x12 mechanical rear mech
Shimano GRX RD-RX820 Rear Derailleur
The mechanical GRX rear mech for 2x12 gravel setups, with cassettes up to 11-36T and a switchable Shadow RD+ chain stabiliser for quiet, secure running off-road. It also serves the GRX RX610 12-speed group.
Highlights
Why we rate it
Calm chain on rough ground
The Shadow RD+ stabiliser cuts chain slap and the risk of drops on washboard tracks.
On-off switch
Turn the stabiliser off for smooth tarmac or to make wheel changes easier.
Wide 2x range
Handles 17T chainring differences with up to 11-36T cassettes for a broad spread of gears.
Tough, light build
Cold-forged aluminium links and body keep it stiff and durable without much weight.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- RD-RX820
- Speeds
- 12
- Actuation
- Mechanical (cable)
- Drivetrain
- 2x
- Max low sprocket
- 36T
- Min low sprocket
- 34T
- Top sprocket
- 11T
- Total capacity
- 42T
- Max chainring difference
- 17T
- Clutch
- Shimano Shadow RD+ with on-off switch
- Chain
- Shimano HG+ 12-speed
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.