Today we're going to be taking a look at the USA Flag Spare Tire Cover. This is going to fit on most spare tires with a diameter between 27 inches and 31 inches. You can find out the diameter of your tire by measuring from the top to bottom when it's properly inflated. The one I'm working with today is around 29 inches in diameter, so you can get an idea of how it would fit on a 29 inch diameter… see more >