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I have a cassette style wheel. How do I measure whether it will take a 7, 8, or 9 speed cassette?

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up vote 5 down vote accepted

I would go to a bike shop, or take some hub you already have.

As far as I know, there are only two sizes: one for 7 and one for 8/9/10 (these are the same, just the distance between the sprockets is progressively smaller to fit).

And if your data-processing capacity and confidence are good, you can dig some info here:

and also

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