The RD-RX820 is compatible with 11-34T and 11-36T 12-speed cassettes, providing a wide gear range so you can spin a comfortable cadence no matter the terrain type. The SHIMANO GRX 12-speed rear derailleur also features an integrated chain stabilizer that delivers quieter shifting and more secure chain management during rough rides. And the chain tensioner has an ON/OFF switch for outings on smooth surfaces.
- Silent and secure rear shifting on rough terrain
- Adjustable chain stabilizer prevents chain slap and drops
- SHIMANO SHADOW RD+
- Smooth and reliable shifting on mixed surfaces
- ON/OFF stabilizer switch matches terrain
- Maximum front chainring difference: 17T
- Top sprocket: Max. 11T/Min. 11T
- Low sprocket: Max. 36T/Min. 34T
- Total capacity: 42T
- Rear speeds: 12
- Compatible chain: HG 12-speed
- Mount: Direct attachment (conventional)
- Direct mount
- Cable adjuster
- Max. front difference: 17T
- Total capacity: 42T
- Low sprocket: Max.: 36T, Min.: 34T
- Top sprocket: Max.: 11T, Min.: 11T
- Fluoric coated link bushings: 4
- Pulley: Guide pulley bearing
- Tension pulley bearing
- Teeth: 11/13T
- Sunken type pulley screw
- Average weight: 270 g
