Shimano Ultegra RD-R8150 Di2 Rear Derailleur - 12-Speed, Medium Cage, Black 2022 Ships within United States Buy Online or Click & Collect Share Loading Facebook Like button... Shimano Ultegra RD-R8150 Di2 Rear Derailleur - 12-Speed, Medium Cage, Black 2022 Ships within United States Buy Online or Click & Collect Share Loading Facebook Like button...