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Eh? I run 700C road wheels and 650B gravel wheels in the Tripster and my missus runs 700C road wheels and either 650B gravel or 700C gravel wheels in her Sequoia.
I thought multiple wheelsets was a pretty normal thing to do.
See also: training and racing wheels.Or do you mean a manufacturer supplying two sets of wheels WITH the bike? In which case, no, never heard of that, but we're bike nerds, we can buy our own second wheelset.
Have anyone actually done this? The only one I know is a customers with a MOOTS having 700 x 32 and 700x 40