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Can you change a 7 speed freewheel to a 6 speed

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Could you give a little more information about your situation and why you're considering a change? – amcnabb Aug 21 '13 at 5:40

In general, yes. They use the same thread/attachment to the hub and they are almost the same width. If you have friction shifting it will work fine, but if you have indexed shifting that will obviously not work - the spacing between cogs is different.

There's more information here

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