10sp and 8/9/10sp freehubs and cassettes - compatability?

Higs
Higs Posts: 105
edited May 2009 in Workshop
Daft question(s) maybe but if wheel I've got which is 8/9/10sp can take either a 9 or 10sp cassette, why can't I put a 9sp cassette on one that's '10sp only'?

What exactly is it that determines which freehubs are compatible with which cassettes?

Is it possible to determine visually (or by measurement) whether a freehub is 8/9/10 or 10sp only?
Higs

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