7 inch wide wheels are the standard fit for 205-225 mm tires on mid-size cars. This width appears most often on 17 inch, 15 inch, 16 inch wheels, and it is sized for 205 to 225 mm tires.
We list 3,651 wheels at this width. Width is what limits your tire choice: mount a tire that is too wide and the sidewall bulges, too narrow and the rim edge takes the hits. If you are between two widths, go with the one inside the tire manufacturer's recommended rim range.