Section width will usually increase about .4" for every 1" wider rim. Measured on a 10" and putting on a 12", will usually add about .8" to section width.
Can't help you on the height, that's just a bit off.
They measured on a 10"... Mine are 10"
Plus the beadlock. The tire is shaped totally different then
the drag radials. The drag radials float around in there with plenty
if room.. I thought a little more section width 13.2 to 13.6 would be
cake... I was wrong! Lol