The Shimano RD-M310 Altus SGS Rear Derailleur Black is a 7/8-speed MTB-style component group for city sport and youth bikes.
In addition to an excellent cost performance, ALTUS provides a feeling of "easy control" that inspires confidence, especially among novice cyclists and younger riders.
7/8-speed MegaRange MTB rear derailleur
Wide link design for more rigidity and precise shifting
Advanced light action
Oversize 15-tooth tensioner and 13-tooth guide pulleys reduce noise and wear
Cage : SGS