i had normal"long wheelbase "rims and 205x16 mudtrack tyres on my LR90 and changed to the ROSTYLE rangerover steel rims with 7.50x16 mudtrack tyres fitted.
the diameter of the 205 tyres was 28 1/2 " and the 7.50x16 tyres are 31 1/2" . i measured the difference between heights of chassis off ground before and after and find a 2 " height increase between the 2 .
the bottom of chassis went from 14"to 16" off ground .
i wanted extra clearance under axles , which the 7.50x16 gave me .
obviously i had measured 2 different sets of rims , being long wheel base rimmed tyres and the others were rangerover rimmed .
i just use kingpin mudtrack remoulds from paddock and the width of actual tread is around 6 1/2 to 7" .
i also have some 235/75x16 bf goodrich AT tyres , these are 28 1/2" diameter but have a wider tread width than the mudtrack tyres