Shimano GRX RD-RX822 Rear Derailleur Enhanced Chain Security and Quieter Shifting Gravel riding has become one of the most popular types of riding. With new drivetrains and components coming out purpose-built for gravel riding, you'll be able to build up the ultimate dream bike. The Shimano GRX RD-RX822 Rear Derailleur has an integrated chain stabilizer that helps prevent chain slaps and drops. It It has smooth and reliable shifting on mixed surfaces with an on/off stabilizer switch to match the terrain. The GS version works with cassettes up to 10-45T and the SGS version works with cassettes up to 10-51T. Features Adjustable chain stabilizer helps to prevent chain slaps and drops GS version works with cassettes up to 10-45TSGS version works with cassettes up to 10-51TWeight: 290g (GS), 288g (SGS) | Shimano | Grx Rd-Rx822 Rear Deraiileur Gs 12-Sp