Bicycle wheel rim alignment gauge-Shimano GRX RX822 Rear Derailleur GS

The Shimano GRX 820 GS Rear Derailleur is an essential component to ensure the smoothest possible shifting on your favorite gravel bike. This derailleur manages a 12-speed system with ease, providing near-silent function and seamless gear changes. It is equipped with Shadow RD+ Technology which is responsible for its silent function as well as a chain stabilizer that can be turned on and off. This reduces chain slap and chain drop and is lighter and more efficient than a roller type chain device. It can be switched off to provide a more pleasant ride on smoother surfaces. The GS version is compatible with your 10-45T 12-speed MTB or gravel cassette. The Shimano GRX 820 Rear Derailleur is a must have for gravel riders.