If your wheel tire diameter is unchanged - Saab 9-3SS Bulletin Board - Saabnet.com
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If your wheel tire diameter is unchanged
Posted by Steeleye (more from Steeleye) on Fri, 24 Sep 2004 17:38:09
In Reply to: 17' rims and tires, nathan [Profile/Gallery]
, Fri, 24 Sep 2004 16:50:36
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you needn't do anything. The 215/45-17 sounds like a straightforward plus-2 upgrade from the base wheel tire dimensions. What you need to be concerned with is the circumference of the package, and how it differs from "stock". For some reason the tire industry expresses tire circumferences in RPM units, revolutions per mile. So, short of calculating out the various numbers on your 15" base vs. the 17" upgrade, you should be able to get the RPM numbers and make a comparison, percentage-wise, to get a feel for the degree of error in your speedo/odo numbers.
Short answer: Don't worry, be happy with your 17's, and take some time in the near future to sweat the small stuff.
posted by 69.136.11...
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