Shimano GRX RD-RX815 Rear Derailleur 11-Speed Long Cage Di2 1x 2x Black
Designed for11-speed Di2 drivetrains. GenuineShimano GRX RD-RX815 rear derailleur. Series: GRX. Designed for1x and 2x Shimano GRX Di2 applications. Shimano GRX RD-RX815 rear derailleur. Rear Derailleur Mount Type: Shimano Rear Direct Mount / 10×1 Standard.