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Old 01-22-2012, 05:21 PM   #1
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Speedo?

I have a 96 gt lowered on eibach ss springs and 18 inch fr500 I had 17 inch saleens and was wondering why my speedo was off by 5 mph with the 17 but not the 18 what could it be
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Old 01-22-2012, 05:42 PM   #2
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It's because of the aspect ratio of your tires. They're taller/smaller depending on the tire size. A 245/45R17 is a different size (height-wise) versus a 285/35R18, it's just like changing your rear gears out.
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