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Formula for Calculating Tire Dimensions

Formula for Calculating Tire Dimensions

Using the above example once again - 225/40R18

  1. 225 mm divided by 25.4 = 8.86 (section width)
  2. Multiply 8.86 (section width) by .40 (aspect ratio) = 3.54 (section height)
  3. Multiply 3.54 (section height) x 2 then add the rim diameter (18) = 25.08 which rounds up to 25.1. 25.1 would be the tire dimension for this particular example.
 
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