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Wheel And Tire Fitment Backspace

Measuring backspacing is almost as simple. Lay a straightedge across the wheel inside the wheel lips and measure from the mounting flange to the straight edge. Make sure the horizontal tool does not include tire sidewall. Some wheel companies measure the lip as part of the backspacing dimension while others don't. The difference is only about 1/4 inch, but it's worth knowing, since that might be the difference you need.
Performance Wheels And Tires Fitment Guide - How to fit those Oh-Too-Wide Wheels And Tires

Measuring backspacing is almost as simple. Lay a straightedge across the wheel inside the wheel lips and measure from the mounting flange to the straight edge. Make sure the horizontal tool does not include tire sidewall. Some wheel companies measure the lip as part of the backspacing dimension while others don't. The difference is only about 1/4 inch, but it's worth knowing, since that might be the difference you need.  View Related Article