When measuring the width of a wheel with no tire mounted, measure only from bead to bead--not the entire width. As a rule of thumb, Weld tells us the bead is usually a half inch from the outer edge of the wheel. That’s why this wheel appears to be 61/2 inches wide overall, but from bead-to-bead it’s considered a 5-1/2-inch-wide wheel.
View Related Article