I had figured I had this all worked out before I bought the wheel/tire combo. Before, on the front, my car had 14x7 wheels with a 3.5" offset and 215/60R14's which makes this about 8.6" wide and roughly 24.3" in diameter -- no tire rub whatsoever. Thinking that my new combination would be the same width but roughly just under 1" taller (radius), I thought 1/2" additional offset would do the trick.