Shimano GRX RD-RX822 1x 12-Speed Rear Derailleur SGS - 10-51t Max

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From BikeTiresDirect

The Shimano GRX RD-RX822 12-Speed Rear Derailleur is a 1x workhorse designed to push you to victory or just over the next hill. Featuring hot-swappable cages for crisper shifting or wider range depending on your preferences this derailleur is ready for anything even if you change your mind later. | Shimano GRX RD-RX822 1x 12-Speed Rear Derailleur SGS - 10-51t Max