Shimano GRX RD-RX820 2x 12 Speed Rear Derailleur Comfortmax Wide gear range of 327%

Wide gear range of 327% - from sprinting on the flats to steep climbs

can be locked forward for easy wheel removal

Petroleum free formula for eco protection

Its Axial Clutch V2 technology reduces drag and lowers friction

Shimano GRX RD-RX820 2x 12 Speed Rear Derailleur Comfortmax Wide gear range of 327%Enhanced chain security and quieter, more stable shifting for gravel ridingThe 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