GRX 1x11 mechanical rear mech
Shimano GRX RD-RX812 11-Speed 1x Rear Derailleur
An 11-speed GRX rear mech for single-ring gravel bikes, sized for 11-40T and 11-42T cassettes. It pairs Shimano's road 11-speed levers with a wide MTB-style range and a switchable clutch.
Highlights
Why we rate it
Big 1x range
Runs 11-40T or 11-42T cassettes for low gears on a single chainring.
Road-lever compatible
Works with Shimano 11-speed road and GRX levers, so there's no need for MTB shifters.
Clutch you can switch
Shadow RD+ keeps the chain settled on rough ground and turns off for wheel changes.
Still current
A good option for keeping 11-speed 1x gravel bikes running with genuine parts.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- RD-RX812
- Speeds
- 11
- Actuation
- Mechanical (cable)
- Drivetrain
- 1x
- Max low sprocket
- 42T
- Min low sprocket
- 40T
- Top sprocket
- 11T
- Total capacity
- 31T
- Clutch
- Shimano Shadow RD+ with on-off switch
- Weight
- 267g (claimed)
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.