If you want to get technical Yeah it is LOL, thats what the whole thing about compairing from manufacture to manufacture. but yes, its a 32", stupid metric system sucks when your in this business.... ahahaha. Yep it all depends on who makes the tire like you said. You can take 4 different tire from 4 different manufactures and they will all be different height and width.

89'Isuzu Trooper LS 5 spd 2.6L
31" Big O X/T's
15x8 Eagle 058's
K&N Filter w/ Air Box Mod
2.25" DynoMax SuperTurbo
PolyUrathane/Indy4X Bushings
Suspension/ FrontEnd Tech/Hunter Certified Alignment Tech.