With an integrated chain stabilizer, Shimano GRX RD-RX822 12-speed rear derailleurs feature an intergrated chain stablizer that delivers quieter shifting and more secure chain management in rough terrain. The chain tensioner has an ON/OFF switch for easy wheel removal.
Largest Cog: 45
Rear Der/Shifter Compatibility: Shimano Road
Rear Derailleur Mount Type: Shimano Rear Direct Mount