Shimano Altus RD-M310 Rear Derailleur - 7 8 Speed Long Cage Black MFPN=78920 Very thick side walls less

Very thick side walls less likely to dent on hang-ups

Dense knit construction for second-skin softness

more comfort

Set of three

Flexible head adjusts and rotates to fit various bike sizes and styles

Shimano Altus RD-M310 Rear Derailleur - 7 8 Speed Long Cage Black MFPN=78920 Very thick side walls lessShimano Altus RD M310 Rear Derailleur 7 8 Speed Long Cage Black. The Shimano RDM310 Smart rear derailleur has a Wide Link design for increased rigidity and precise shifting. Oversized 15 tooth tensioner and 13 tooth guide pulleys reduce noise and wear SMART CAGE pulley plate provides more ground clearance Advanced light action with precise shifting Compatible with Shimano HG 6 7 8 speed chains TECH SPECS Largest Cog 34 Color Black Rear Der Shifter