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Old 08-09-2011, 05:23 PM
MADDOG MADDOG is offline
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Default Determining Speedometer Error Due To Tire Size Change

When you change tire sizes, you will experience some speedometer error. Indicated speed may not be your actual speed.

So, if you are curious about how big of a change you will experience, go here:

Speedometer Error Calculator

Then, plug in your stock tire size (or your current tire size if you have adjusted your PCM for this using a programmer) and the new tire size to see what the change will be.
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