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<blockquote data-quote="limitedex" data-source="post: 15544423" data-attributes="member: 137313"><p>315millimeters divided by 25.4 (25.4mm/in.) = 12.40" wide tire.</p><p></p><p>Multiply 12.40 by the aspect ratio which in this case is .30. Now you know the side wall of the tire. </p><p></p><p>Multiply that number by two (because there are two sidewalls per tire = 7.44" of TOTAL sidewall tire on the rim. </p><p></p><p>Simply add the diameter of the wheel, which is 20 in this case, and you have the overall diameter of the tire. 27.44" </p><p></p><p>315/30/20 = 27.44"</p></blockquote><p></p>
[QUOTE="limitedex, post: 15544423, member: 137313"] 315millimeters divided by 25.4 (25.4mm/in.) = 12.40" wide tire. Multiply 12.40 by the aspect ratio which in this case is .30. Now you know the side wall of the tire. Multiply that number by two (because there are two sidewalls per tire = 7.44" of TOTAL sidewall tire on the rim. Simply add the diameter of the wheel, which is 20 in this case, and you have the overall diameter of the tire. 27.44" 315/30/20 = 27.44" [/QUOTE]
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