With its integrated chain stabilizer and medium cage, the Shimano GRX RD-RX820 1x12-speed rear derailleur delivers quiet shifting, better ground clearance and secure chain management on rough terrain.
- Compatible with 10–45T, 12-speed Shimano MTB cassettes (not included)
- Shimano SHADOW RD+ technology with an adjustable chain stabilizer to prevent chain slap and drops
- Chain tensioner has an on/off switch for smooth and reliable shifting on mixed surfaces and easy wheel removal
- Top sprocket: maximum 10T/minimum 10T
- Low sprocket: maximum 45T/minimum 45T
- Total capacity: 35T
- Interchangeable, replaceable GS/SGS derailleur cage
Imported.
View the Shimano GRX Product LineView all Shimano Rear Derailleurs| Best Use | Gravel Cycling |
|---|---|
| Derailleur Type | Rear |
| Cage Length | Medium Cage |
| Max Rear Cog Size | 45T |
| Speeds | 12-speed |
| Weight | 290 grams |