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
Total capacity: 42T

PRODUCT SPECIFICATIONS

MODEL NO RD-RX820
SERIES GRX 12-speed
Color Series color
Average weight 270
Rear speeds 12
Compatible chain HG 12-speed
Top-normal spring type|SHIMANO SHADOW RD
Mount|Direct attachment (conventional)
Mount|Direct mount
Cable adjuster
Max. front difference 17T
Total capacity 42T
Low sprocket|Max. 36T
Low sprocket|Min. 34T
Top sprocket|Max. 11T
Top sprocket|Min. 11T
Fluoric coated link bushings 4
Pulley|Guide pulley bearing
Pulley|Tension pulley bearing
Pulley|Teeth 11/13T
Pulley|Sunken type pulley screw
B-axle|Hollow axle