The Shimano MF-TZ31 7-Speed Multiple Freewheel, 14-34 T MegaRange makes those steep and impossible hills easier to manage with the use of the Shimano super-low 34T gear system and its specifically engineered smooth chain movement up and down the block. A desirable, stylish and efficient freewheel easily fitted onto compatible screw on hub; ultimately suitable for the extreme mountain bike riders as well as a large range of other bicycles. Designed for 7 speed gear systems this Shimano MF-TZ31 7-Speed Multiple Freewheel, 14-34 T MegaRange is an absolute must have part in the creation, maintenance or replacement of your bike.