Just experience here, with stock ride height vehicles, no claim to authority. Refer to the info referenced above. You ask about 15x7"; I have a set of 2wd GMC factory 15x7's with 235-70 R15's that fit nice, and the stock ride height is good still, I like them, though they are wider than stock. I also have a set of factory steel 15x7's with 235-75 R15's and those fit good and would look good to some of us, but not stock and the height is altered, jacked up a bit. The vehicle I'm talking about is an '85 S15 2wd all stock. My favorite stock looking wheel is a 15x6" steel with 205-75-R15 tires, fits good, looks good, handles good, looks factory mostly. However I would not put a 205 onto a 7" rim, myself.