Join Date: Jan 2011
Location: SE Michigan
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For future reference heres a math formula that breaks down tire height.
325mm Tread Width X 65% (aspect ratio)=profile (ammount of sidewall exposed) in mm.
325 X .65= 211.25 mm divided by 25.4 to convert mm to inches = 8.31 inches
Take 8.31 X 2 because you have profile on the top and bottom of the rim= 16.62 inches.
Take the 16.62 inches of overall profile and add your rim size 18 inches and you get 34.62 inches of overall tire diameter.
Hope this helps.
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