Shimano Altus RD-M310 7/8 Speed Top Normal Rear Derailleur - Black - SGS / Long Cage

- Altus mountain bike rear derailleur with light action operation and over-size pulleys for a wide gear choice
- Oversize 13/15-tooth tension and guide pulleys to reduce noise and wear
- Extension spring and low-friction fluorine-coated link pivot bushing result in a light shifting action
- Top normal spring for use with rapidfire shifters
- IG and HG chain, 7- and 8-speed compatible
- For use with 28 to 34 tooth low rear sprockets, total capacity 43 teeth