my tire sidewall measurement formula
ex. 205/40/16
first number is the width of the tire in millimeters
second number is a percentage 40% of 205 is the size in millimeters your sidewall measures
third number is the wheel size
40% of 205 is 88mm and is about 3.2 inches
16 + 3.2 + 3.2 = 22.5 inches
ex2. 205/50/15
50% of 205 is 102.5 which calculates to 4 inches
15 + 4 + 4 = 23 inches
The answer: ^^^^^