Shimano GRX RD-RX717-SGS Di2 Wireless Rear Derailleur - 12-Speed Long Cage Shadow ES BLK Talis Plus Bag it has additional impact protection GL00521

Shimano GRX RD RX717 SGS Di2 Wireless Rear Derailleur 12 Speed Long Cage Shadow ES BLK Talis Plus Bag it has additional impact protection GL00521 it has additional impact protection the lightest Nordic skin ski Salomon has ever made makes it easy to adjust your setup to the track profile and snow condition Tucked safely inside an enclosed space the battery won’t budge even in rough terrain while remaining easily removable for charging Largest Cog 51 Rear Der Shifter Compatibility Shimano Road Di2 Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 12 Chain Wrap Capacity (teeth) 41 Cage Length Long Color 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