''205R16'' Usually there is a third number like the P205 55 16's on my car. ''P'' means passenger, the tire is 205 mm wide, and fits on a 16'' rim, yeah, consistent. The 55 means it is 55% as high as wide. 205mm/25.4mm/in(.55)(2) + 16 gives you the overall diameter in inches. I think that is what the 31 in ''31x10.5R15'' is, 10.5'' wide, and fits on a 15'' rim.
Usually you can use a slightly larger tire without it rubbing the wheel well, or only slightly on bumps and turns.
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