Riders of 7 speed hybrids, kids' bikes and entry mountain bikes with a threaded rear hub who want an easier low gear.
The Shimano Tourney MF-TZ500-7 is the standard replacement freewheel for 7 speed bikes that use a screw-on (threaded) hub rather than a cassette freehub. It is what you will find on plenty of entry hybrids, kids' bikes and older mountain bikes.
This 14-34T version uses Shimano's MegaRange layout: the smaller sprockets are closely spaced for cruising, then a large 34T sprocket gives you a genuine climbing gear for steep driveways and hills.
A worn freewheel is a common cause of skipping gears, especially after a new chain. Swapping chain and freewheel together is the usual fix and brings a tired bike back to crisp shifting.
Screw-on fit
Threads straight onto a freewheel-type rear hub.
Low 34T gear
MegaRange bail-out sprocket for steep climbs.
7 speed
Direct replacement for most 7 speed freewheels.
Smooth shifting
Shaped teeth guide the chain between sprockets.
Freewheel
Compatibility
MegaRange
A big jump to the largest 34T sprocket gives a very low climbing gear while keeping close steps in the rest of the block.
Hyperglide shift ramps
Shaped sprocket teeth help the chain move smoothly up and down the block.
Great for
Maybe not for
Check your wheel has a threaded freewheel hub: freewheels screw on and are removed with a freewheel tool, while cassettes slide onto a splined freehub. Your rear derailleur must be able to handle a 34T largest sprocket; Shimano Tourney MegaRange derailleurs are designed for it.
Freewheel or cassette?
If the sprockets come off with a splined tool that sits inside the cluster and the whole block turns on the hub, it is a freewheel. Bring the wheel in if you are not sure and we will check it in seconds.
Replace the chain too
A new freewheel with an old stretched chain will often skip. Fit a new 7 or 8 speed chain at the same time and check the derailleur can wrap the 34T sprocket.
The drivetrain on most of the world's bikes.
Shimano was founded in Sakai, Japan in 1921 and started out making freewheels.
It is now the world's largest maker of bicycle components, from entry-level Tourney parts to Dura-Ace race groupsets.
