There are different sized tires that are going to fit on both 12 inch and 13 inch wheels so I will give you the diameters of those. For a tire that fits on a 12 inch wheel that is size 145/80-12 such as the Kenda Karrier # AM10130, it will have a diameter of 21.1 inches.
A 13 inch wheel is likely going to use a 175/80-13 sized tire like the Kenda # AM10210, and the diameter of that tire is going to be 24 inches. view full answer...
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