Compatible with both 7 or 8-speed gearing systems, this Altus M310 mountain bike rear mech brings you a reliable, easy shifting action and its highly versatile. With the ability to work in a drivetrain that has a 2x or a 3x chainset, it will ensure you enjoy clean gear changes across your entyre gear range. This is further enhanced by the derailleur's bushings, which are Teflon coated and a highly efficient internal spring. Ideal for leisure and touring cyclists, it's ready to work with any flat bar Shimano 7 or 8 speed rear shifter.