With an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner. The RD-RX812 rear derailleur is compatible with mtb cassettes with a 42T low sprocket max.

Features
SHIMANO SHADOW RD (11-speed)
Adjustable chain stabilizer prevents chain slapping and drops
Toggle clutch ON/OFF to match the terrain
Switch stabilizer ON/OFF to match the terrain
Gravel-tuned clutch tension
Silent and uninterrupted rear shifting on rough terrain

Specifications
Series: Shimano GRX 11-speed
Top Sprocket Max: 11T / Min. 11T
Low Sprocket: Max. 42T / Min. 41T
Total Capacity: 31T
Smooth and reliable mixed surface shifting
Compatible with current road DUAL CONTROL LEVER
Top Sprocket: Max. 11T / Min. 11T
Compatible Chain: HG-EV 11-speed / HG-X11
Pulley Teeth: 11t
Rear Speeds: 11-speed

Mfr Claimed Weight
267g