With Campagnolo freehubs - yes, with shimano you can put a 10speed cassette on an 11 speed freehub with a spacer but you can’t run an 11 speed cassette on an 10 speed freehub unless you go to some mtb cassettes for reasons I can’t remember…
Of course, 11 takes 10 but 10 doesn't take 11, that's what I was misremembering, thank you.
@scotts started
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With Campagnolo freehubs - yes, with shimano you can put a 10speed cassette on an 11 speed freehub with a spacer but you can’t run an 11 speed cassette on an 10 speed freehub unless you go to some mtb cassettes for reasons I can’t remember…