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Racing Tire size

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Old 06-14-2011, 10:05 AM
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RaleighSS
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Default Racing Tire size
Anyone know how to convert these to sizes we are more familiar with ?

The fronts are 280/ 650 R18



The rears are 320/650 R18
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Old 06-14-2011, 10:20 AM
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geerookie
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285/35-18
325/30-18
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Old 06-14-2011, 10:35 AM
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RaleighSS
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Originally Posted by geerookie
285/35-18
325/30-18

Cool thank you
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Old 06-14-2011, 04:53 PM
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froggy47
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Originally Posted by geerookie
285/35-18
325/30-18
Is it a formula or a table?

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Old 06-14-2011, 05:06 PM
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Originally Posted by froggy47
Is it a formula or a table?

18 inches x 25.4mm per inch, 457.2mm wheel

285mm wide tire, 35% of that is 99.75mm sidewall

457.2 + 99.75 + 99.75 = 656.7 close enough to 650


Race tires are spec'd in width & diameter in millimeters.
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