I really don't want to get into the fray of this latest tire math
discussion.  But a few years ago I played with some alternative
tire/rim combinations on another vehicle.  It seemed to me that the
amount of lower radius reduction which occurs as a result of foot
print "crush" formation can vary significantly between different tire
designs.  It was maddening that it didn't seem to be only related to
psi and unloaded diameter, but they didn't adequately explain our
observations.  So I wasn't so skeptical about the non-intuitive
vehicle-height/tire-diameter suggestion.  If loaded tire treads formed

nearly perfect circles, the simple intuitive ratio relationship would
always exist.

Confusion reigns, but it never pours.
John