The forum's tire guru, WMTire, reminded me a few years ago that the nominal "size" of a tire (14-inch, 15-inch, etc) refers to the size of the hole in the middle of the tire. Nothing else. So you can have a 14-inch tire that is quite narrow, or really really wide. And it can have huge diameter like a tractor tire, or a diameter that is not much more than 14 inches. If you have seen pictures of cars called "low-riders", you have seen this.
Bill
Bill