Shimano GRX RD-RX812 Rear Derailleur – 11-Speed Long Cage Black With Clutch For 1x 42t Low Sprocket Max. The Shimano GRX 11-speed rear derailleur has an integrated chain stabilizer mechanism that provides a quieter experience shifting security and precision on mixed terrain. For rides on smooth surfaces the derailleur features an ON/OFF switch for the chain tensioner. The Shimano Shadow RD+ adjustable chain stabilizer provides silent and uninterrupted rear shifting on rough terrain.

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