28inch is diameter as far as I'm aware. 28/2 is 14in radius.
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A 235 85 16 tire is 31.72 inches in diameter and has a 15.86 inch radius and a 99.65 inch circumference
The diameter of a 28-square inch circle is: 5.971 inches.
The radius of a circle with a 14.5 inch circumference is 2.15 inches
1 inch
radius of 31 inches