Shimano GRX RX820 takavaihtaja 11sp, 40-42T

With an integrated chain stabilizer mechanism, the SHIMANO GRX 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-RX820 rear derailleur is compatible with road cassettes with a 42T low sprocket max.