I was thinking about the old hub to hub measurement. I suppose that they may have been thinking about hard surfaces that cannot not slide or fold around objects. A thought that outside of WHEEL might be a more standardized way of measuring that makes tire pressure irrelevant to try to standardize things, if that's the route that we have to go.
I am 82" outside tire with my IROKs, 80" with the Krawlers.
The IROKs are 39.5x13.50 and the Krawlers are 39x13.
Wheelbase is 106.5"
President, Faithwheelers Offroad Club