Freewheel


Close-range freewheel

Photo by Chris 73, via Wikimedia Commons

 


Wide-range freewheel
Photo by flickr.com/photos/kky/6021195165/ [CC BY-SA 2.0]

a freewheel is one or more sprockets on the rear wheel that allow coasting. Some people will call this “cassette” which more specifically means a series of sprockets that can be removed as a unit from a ratcheting unit built into the hub. That kind of hub is called a “freehub.”


Freehub

Others may call the freewheel a “cog” which more generally means a single rear wheel sprocket. A true freewheel has the racheting mechanism built into the sprocket assembly, not the hub, and fastens to the hub with large diameter, closely-spaced threads.

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