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It is possible to put a 6 speed back wheel on a 21 gear bicycle but you will never be able to use more than the 6 gear allowed by that cassette sprocket.
The best way to take advantage of the 21 gear bicycle is to change that 6 speed cassette sprocket and replace it by a 7 speed cassette sprocket. This way you will keep that back wheel and also be able to use all 21 gears of your bike.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoFirst off, give up this 18/21 speed nonsense. Tha may be how many dealers label their bikes, but if you gonna mix n' match you're better off referring to the number of rear sprockets. 18 speed can be both 2 front and 9 rear(2x9) or 3 front 6 rear(3x6), with your 21-speed is a 3x7.
Anyhow, a 3x6 is limited to a design called a freewheel, where the mechanism that allows you to coast is integrated with the sprockets.
A 3x7 can be either a freewheel or a freehub(where sprockets and coasting mechanism are treated as separate pieces). And yoy can't put sprockets from a freehub wheel onto a freewheel wheel.
If both the 3x6 and the 3x7 are freewheels then you can move the freewheel (= the sprocket pack) from one over to the other. But the 7-speed freewheel takes up more axle space than the 6-speed, so you'l likely have to add some spacers.
I'll post a link where there are nice pics and explanations on how to tell them apart.
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