Shimano GRX 2×11 Rear Derailleur

With an integrated chain stabilizer mechanism, the Shimano GRX Rear Derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON/OFF switch for the chain tensioner. The RD-RX810 rear derailleur is compatible with road cassettes with a 34T low sprocket max.