325's = 35's or 37's???

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Thread: 325's = 35's or 37's???

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    Junior Member lsturbointeg's Avatar
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    Default 325's = 35's or 37's???

    hey guys! i've been trying to look for the metric conversion chart but anyone know if a 325 is the same as a 35 or 37's?? i know a 315 is compared as a 35.
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    Default Re: 325's = 35's or 37's???

    It all depends on what the aspect ratio is.


    That number you posted up is the width of the tire in millimeters. So 325=12.79" wide. The conversion from millimeters to inches is 25.4.

    The second number for a metric tire, ex: 325/75/16 is the aspect ratio. You have to take that percent number and times that with the width of the tire.

    ex: 325 x 75% = 243.75mm

    That number is your sidewall height. Now times that number by two because a tire has two sidewalls.

    243.75 x 2 = 487.5mm

    Now convert that to inches

    487.5/25.4 = 19.19 inches

    Now add that to the wheel height or the third number for the metric tire

    19.19 + 16 = 35.19 "

    That is the height of the tire.
    So a 325/75/16 tire is similar to a 35.19" x 12.79" x 16" tire.
    Got it?


    I hope I helped you out.

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