Product Description
The Shimano GRX RD-RX820 rear derailleur is built for smooth, secure 12-speed gravel shifting across mixed terrain. Designed around Shimano’s GRX gravel platform, it is compatible with 11-34T and 11-36T 12-speed cassettes, giving riders a wide usable range for steep climbs, rolling gravel, and fast mixed-surface riding.
An integrated chain stabilizer helps reduce chain slap and improve chain security on rough rides, while Shimano’s Shadow RD+ design keeps the drivetrain quieter and more controlled. The stabilizer can be switched ON or OFF depending on terrain and rider preference.
This derailleur is in take-off condition and may show light handling marks, small scuffs, or minor signs of installation/removal. Any wear present is expected to be cosmetic only unless otherwise noted.
Key Features
- Genuine Shimano GRX RD-RX820 rear derailleur
- Designed for 12-speed gravel drivetrains
- Compatible with 11-34T and 11-36T cassettes
- Integrated Shadow RD+ chain stabilizer
- Helps reduce chain slap and dropped chains
- Quiet, stable shifting on rough terrain
-
ON/OFF stabilizer switch to match terrain
- Compatible with HG 12-speed chains
- Take-off condition
Specifications
- Brand: Shimano
- Series: GRX
- Model: RD-RX820
- Product Type: Rear Derailleur
- Drivetrain Speeds: 12
- Largest Cog: 36T
- Chain Wrap Capacity: 42T
- Rear Derailleur / Shifter Compatibility: Shimano Road
- Rear Derailleur Mount Type: Shimano Rear Direct Mount, 10x1 Standard
- Weight: 270g
- Manufacturer Part Number: IRDRX820
Compatibility
Compatible with:
- Shimano 12-speed road / GRX drivetrain systems
-
11-34T and 11-36T 12-speed cassettes
- HG 12-speed chains
- Frames using a standard 10x1 derailleur mount or compatible Shimano Rear Direct Mount setup
Please confirm cassette range, hanger style, chain compatibility, and shifter compatibility before purchase.
Included
- One Shimano GRX RD-RX820 rear derailleur
Warranty and Notes
- Take-off condition
- May show slight handling marks or small cosmetic scuffs from installation or removal
- Includes only what is shown or described
Condition
- Take-off
- May show minor cosmetic marks from handling or removal
- No known structural damage
- Genuine OEM product
- Includes only what is shown or described
