Welcome to AFM! A wheel size will have two values... ie 17x9. In this case the 17 refers to the wheel diameter and the 9 refers to the width. Tires have three values... ie 245/45 17. In this case the 245 refers to the width of the tire, the 45 is the height as a percentage of the width and the 17 says this tire will go on a 17 inch wheel. There are many, many combos of widths and sizes and sizing depends on what car you have and what the manufacturers recommend. We have a Wheels and Tires section that can explain things a lot further than my simplified version.
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