Shimano Rear Derailleur RD-RX812 GRX 11-SPEED, 1x11

The Shimano RD-RX812 is a GRX 11-speed rear derailleur built for gravel riders running a 1x11 drivetrain.

Shimano gives it a long GS cage to wrap an 11-40T or 11-42T cassette with 31 tooth total capacity, and a Shadow RD+ clutch with an on/off switch to quell chain slap on washboard and chunk. At 267g it holds shifts secure over rough terrain.

As the 1x-specific GRX unit, this derailleur pairs a wide gravel range with a quiet, stable chain.