Is a 325 65 18 a 35" tire? - Ford Powerstroke Diesel Forum
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Old 10-29-2012, 06:32 PM
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Is a 325 65 18 a 35" tire?

I'm trying to figure out my tire size and see what other size options I may have that are similar in height

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Old 10-29-2012, 06:50 PM
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According to TireRack, the overall diameter is 34.6" with full tread. So I would say yes, it's a 35".
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Old 10-29-2012, 06:55 PM
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Damn I feel kind of dumb that u never thought of checking there. Thank you

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Old 10-30-2012, 12:37 PM
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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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Old 10-30-2012, 12:47 PM
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