Shimano RD-M310 Rear Derailleur Altus 7/8-Speed Black
The Altus M310 is an affordable but high-performing rear derailleur.
Ideally suited to a 7 or 8-speed drivetrain, it has enough capacity to handle a double or triple crankset. With its light action design, teflon coated bushings, and efficient spring, this derailleur is perfect for leisure cycling and touring.