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Old 07-04-2008, 09:04 PM   #10

Sterling's Avatar
Drives: 2010 Camaro 1LT/RS M6
Join Date: Nov 2007
Location: Fairhaven, MA
Posts: 5,887
That is a measurement in millimeters...
The numbers on a tire are: the width in millimeters/ height measured as a percentage of the width/ the rim diameter.

So say a 305/65/R15 has a width of 305 millimeters, a height that is 65% of that (198.25 millimeters) and a 15 inch diameter rim.

Edit: 305 mm = about 12 inches(12.00785)
mm x .03937 = inches
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