mstateglfr sorry for the confusion. Allow me to re iterate.

I see lots of options out there with 700c x 45 as well as 650b x 45 . Im trying to understand why one would make more sense over another?

Also, I see 700c gravel bikes out there which claim to also fit a 650b wheelset without offering enough tire clearance to fully compensate in diameter. Would such a change not throw off geometry figures enough to avoid doing so?