With an integrated chain stabilizer mechanism, the GRX rear derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features an on/off switch for the chain tensioner. The RD-RX820 rear derailleur is compatible with MTB cassettes with a 42T low sprocket max.
GRX 12 speed rear derailleur for double cranks
Adjustable chain stabilizer prevents chain slapping and drops
Gravel-tuned clutch tension can be toggled ON/OFF to match the terrain
