On the stock wheel and tire I measured from the mounting surface to the edge of the metal rim. So the bead would be inside by roughly 1/2" or so. The tire bulges out another 1-1/2" or so beyond at the sidewall. So if the correct measurement is from the mounting surface to the tire bead it would be about 3-1/2". From mounting surface to outermost tire bulge at the sidewall is about 5-1/2", if that makes sense.
