Well, this seems very weird. All this time, I've assumed that running the same wheels under different width tires front to rear would be a "don't do that" thing: handling would be affected by doing that. Similarly, different width rims would stretch the tire on the wider rims, which I have also assumed would affect handling. "Staggered" means wider tires on wider rims and narrower tires on narrower rims. But people are always mixing and matching, either out of a lack of concern or out of expediency, I suppose.