Shimano Altus RD-M310 Rear Derailleur - 7,8 Speed, Long Cage, Silver 2017 Ships within United States Buy Online or Click & Collect Share Loading Facebook Like button... Shimano Altus RD-M310 Rear Derailleur - 7,8 Speed, Long Cage, Silver 2017 Ships within United States Buy Online or Click & Collect Share Loading Facebook Like button...