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Old 04-02-2016, 05:41 PM
gt63 gt63 is offline
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Join Date: Sep 2015
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Default do I need to adjust my speedometer

my 4th gen st came with 18" steel wheels, I purchased a set of stock 20" with the factory tires 275/60/20 that are about 2" taller than the 18's, do I need to bother with going to the dealer to have a speed correction done, does anyone now how much my speed will be out from the tire size difference.

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Old 04-03-2016, 08:10 AM
daggertats daggertats is offline
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the new tires will make the speedo read faster.... about 2 mph or so.use this for a comparison
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