Shimano GRX RD-RX820 Rear Derailleur Shadow 2x12

Enhanced chain security and quieter shifting for gravel riding
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.
Features

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
Top sprocket: Max. 11T/Min. 11T
Low sprocket: Max. 36T/Min. 34T
Total capacity: 42T
Interchangeable, replaceable GS/SGS derailleur cage

Specifications

Model No: RD-RX820
Series: GRX 12-speed
Average weight: 270
Rear speeds: 12
Compatible chain HG 12-speed
Low Sprocket Max/Min: 36t
High Sprocket Max/Min: 11t
Range: 42t