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      11-12-2012, 01:02 PM   #16
PSUSMU
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Drives: Entry-level Luxury
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Quote:
Originally Posted by Tim603 View Post
I believe it has to do with the circumference. The Rear tires circumference and the Front tires circumference and the difference between the two. Your original tires are irrelevant
That is front/rear. The "original/new" terms are copied from the e90post tire calculator. Circumference is a function of diameter.