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Old 02-05-2010, 02:49 PM   #23
Nine Ball



 
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Drives: 1969 & 2011 Camaro SS
Join Date: Oct 2008
Location: Houston, TX
Posts: 3,833
30 is not a size, it is a percentage. The number means nothing unless you know the width of the tire.

Example,
315/25-22

Translation:
315 millimeters wide
Sidewall thickness is 25% of the width (315mm x 0.25 = 78.75 mm = 3.1 inches)
22 inch wheel size
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