Bicycle Cassette Guide
The most common cassette type is the nine-speed variety. Combined with three chainrings on the chainset, it provides 27 gears. The larger sprockets provide lower gears for easier climbing, while the smaller sprockets provide higher gears for faster speed.
Freewheels are an older style of cog mechanism, which have been mostly superceded by cassettes. They are often found on single speed bicycles. A freewheel has a cog mechanism built into it, while a cassette slides onto a grooved part of the rear hub that contains the cog part.
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Bicycle Cassettes - Bicycle Freewheels