I'm running the original Jeep Gambler wheels plus 33x10.5 BFG KM1s. The Gamblers are 15x8 with a backspace of 5.25". I noticed after I mounted the new tires that I just rubbed ever so slightly on my front lower control arms during full turn locks. I was able to mitigate the rubbing by adding a washer to my steering stops.
After I installed my dual rate SwayLOC swaybar, my passenger tire rubbed on the SwayLOC's arm. At this time I purchased and installed 1.25" wheel spacers/adapters. This additional piece of hardware converted my 5.25" backspacing to 4"