Jim.. I don't quite understand your explanation( that could be an old-age thang)..I know you wouldn't put bigger wheels on the front and what does "one on each side" mean? are you pulling my leg I know you can physically put 17's on front and 18's on rear but thought I read it would mess up something mechanically..
So all will be good to do this, right?
If you were to put a 17 on one side of the back and an 18 on the other would be bad .17s on the fronts and 18s on the back will not cause any harm . And leg was pulled