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)
Imported.
View the Shimano GRX Product LineView all Shimano Rear Derailleurs| Best Use | Road Cycling |
|---|---|
| Derailleur Type | Rear |
| Cage Length | Medium / Long Cage |
| Max Rear Cog Size | 42T |
| Speeds | 11-speed |
| Weight | 267 grams |