Performance Bike
Shimano Altus RD-M310-L Rear Derailleur (Black) (7/8 Speed) (Long Cage)
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From Performance Bike
Shimano Altus RD-M370/M310 Rear Derailleurs Features: 7/8-Speed 13t upper and 15t lower pulleys Specs: Rear Derailleur Mount Type10x1 Standard Cage LengthLong Largest Cog34 ColorBlack Rear Der/Shifter CompatibilityShimano Mountain