To help identify your wheel size, look at the tire sidewall. The wheel size will be the last two digits, often after the letter "R":
The measurement for width is measured between the wheel outer beads:
Bolt Pattern can be calculated as follows depending on the wheel lug count:
A wheel's offset is essentially the difference between the backspacing and the centerline:
- To determine the wheel's backspacing, place a straightedge across the inboard flanges and measure the distance from the straightedge to the mounting surface.
- To determine the centerline, measure the width and divide by 2.
- To calculate the offset, take the Backspacing number, subtract the Centerline number, and subtract an additional .5 inches (this compensates for the approximate .5 inches of inboard flange).
