C=pi * d
C=pi * 85
pi is approximately 3.141592
85 * 3.14592=267.4032
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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
31.4 in
circumference = pi*diameter so diameter = circumference/pi = 4.456 inches
Diameter = Circumference/pi = 1.91 inches, approx.
Circumference = 37.7 inches Diameter = 12 inches