11sp cassette on a 10sp freehub.
Edco were manufacturing a 11 speed monoblock cassette in CrMo hardened material to use on 10 speed free wheels for about £150 ish. I can't find it on there site now though ..
Very much looking forward to full wireless shifting. Means it will be compatible with almost all frames, including older 90s/00s frames.
@Oswald started
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11sp cassette on a 10sp freehub.