Shimano GRX RD-RX717-SGS Di2 Wireless Rear Derailleur – 12-Speed Long Cage Shadow ES Black

The Shimano GRX RX717 Di2 Wireless rear derailleur paired with a 10-51t cassette (cassette sold separate) gives gravel riders the speed range and robustness to pursue any gravel challenge. With built-in automatic impact recovery an impact-deflecting shape and solid pulleys this derailleur stands up to hard impacts and still retains its lightning-quick shifting performance.