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The tire sizing is pretty straight forward. For example:
195/60ZR15
195 is the maximum width of the tire at the side wall in
millmeters.
it is not the tread width. Tread width will be
less.
60 is the side wall height as a percentage of the width.
In this case 60% or 117 mm.
Z is the speed rating. Near to the end of the alphabet is
faster.
R designates radial
15 is the wheel diameter in inches....( there we go again
mixing units)
It has always been my understanding that the default aspect
ratio for the side wall height is 85%. So if it is not
specified in the side wall markings, as in the case of the
165R15, it is assumed to be 85%. Therefore our standard
tire is 165 mm (6.5 inches) wide (on a 4.5 inch rim) and is
26.0 inches in diameter (15+0.85*165*2/25.4).
For more information and a good source of tires at decent
prices check out:
http://www.tirerack.com
Hope this helps. BTW the Empi's should be 5.5 inches wide
and will fit inside the 165R15 without a problem.
--
John Jaranson
Research Engineer
Ford Motor Company
SRL 2621
Dearborn, MI 48121
(313)323-0553
(313)845-4724 FAX
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