Enhanced chain security and quieter, more stable 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
Maximum front chainring difference: 17T
Top sprocket: Max. 11T/Min. 11T
Low sprocket: Max. 36T/Min. 34T

Specifications
Rear speeds 12
Compatible chain HG 12-speed
Low sprocket|Max. 36T
Low sprocket|Min. 34T
Top sprocket|Max. 11T
Pulley|Teeth 11/13T

Mfr Claimed Weight 
270g