Shimano GRX RD-820 Rear Derailleur

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.

Specifications:

Cage Length: One-Spec
Total Capacity: 42T
Max Front Difference: 17
Cable Adjuster: X
Color: SERIES COLOR
Average Weight: 270g
Mount: Direct attachment (conventional)
Guide Pulley Bearing: X
Tension Pulley Bearing: X
Number Of Pulley Teeth: 11/13T
Max Low Sprocket    36
Min Low Sprocket    34
Rear Speeds    12