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i know tires fairly well i have worked at discount tire for almost four years now and you can do the math pretty quickly in your head. just think about it like this. the first number is your "section width" the second number is the "aspect ratio" so a 225+40
is 225 milimeters wide with a side wall that is 40 percent of that so a 225+45+17 would be the same height as a 235+40+17 well damn close if not exact
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