Shimano GRX 812 11-Speed Rear Derailleur

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Offering silent, uninterrupted rear shifting on rough terrain, the gravel bike–specific Shimano GRX 812 11-speed rear derailleur is compatible with MTB cassettes with a 40- or 42-tooth low sprocket.


  • With a 31-tooth total capacity, the GRX 812 11-speed rear derailleur handles an 11-tooth top sprocket and 40- or 42-tooth low sprocket—ideal for wide-range 1x systems
  • 11-speed SHADOW RD+ system features a clutch and chain stabilizer that can be switched on or off to match terrain
  • Switch gravel-tuned clutch on to increase chain tension and reduce unwanted derailleur cage movement on rough surfaces (for easier rear wheel removal, switch clutch off)
  • Switch adjustable chain stabilizer on to reduce chain slap, improve chain retention and make riding over uneven surfaces quieter
  • Compatible with current road dual control (brake/shift) levers (not included)
  • Designed for use with Shimano HG-EV 11-speed or HG-X11 chains (not included)


View the Shimano GRX Product LineView all Shimano Rear Derailleurs

Technical Specs

Best Use

Road Cycling

Derailleur Type


Cage Length

Medium / Long Cage

Max Rear Cog Size





267 grams

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