To run Hoosier 8X26.5X15 or AR 500 (same size) on a 15X8 rim, what backspace/offset would I need for a cavalier? Will I have clearance issues? I have looked at so many references my head is spinning. I figured y'all would have some first hand experience. We picked up some tires at a ridiculous price. None have more that 2 races on them. Most have only 1. Also, did we maybe buy tires too big to run on the cavalier? This is for an oval dirt track car. Thanks guys.