With Campagnolo you can put an 11 speed cassette on any freehub from 8 speed up.
No you can’t. 8 speed is incompatible with 9/10/11 speed. Some 9/10/11 speed hubs won’t take an 11 speed cassette as the lockring won’t get enough purchase to tighten enough.
@Sumo started
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With Campagnolo you can put an 11 speed cassette on any freehub from 8 speed up.