Shimano GRX RD-RX817 Rear Derailleur 11-Speed Long Cage Di2 1x Black
Designed for11-speed Di2 drivetrains. GenuineShimano GRX RD-RX817 rear derailleur. Designed specifically for1x Shimano GRX Di2 applications. Series: GRX. Shimano GRX RD-RX817 rear derailleur. Rear Derailleur Mount Type: Shimano Rear Direct Mount.