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Old 12-31-2004   #1
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Changing rim and tire size

I was told by the dealer that I can not change the rims from the current 18" stock to a 19" or 20" size without reprogramming the computer.

Is that correct? If so, how can I do that? Thanks for the info and help...

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Old 12-31-2004   #2
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As long as the actual tire diameter doesn't change.... you won't need to do that.

Remember, the speedo reads about 3-miles per hour faster than you're actually traveling, so there's that margin.

If you have a 55 series tire on an 18inch wheel (stock) and move up to a 20 inch wheel with a 50 or 45 series tire, it won't have a major impact, in any, on your speedo.

Am I correct here???

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Old 12-31-2004   #3
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Changing rim and tire size

TREGinginCO:

Thanks for the reply. That's what I think too. But that's why I was unsure after the dealer (salesperson) told me differently.

Theoretically, if the OS tire diameter doesn't change, then the speedo etc. shouldn't care what size rim the tire is on...
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Old 12-31-2004   #4
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go to this site, fill in your original tire/rim size and and the new tire/rim size and it will calculate the difference in speed and diameter

http://www.1010tires.com/TireSizeCalculator.asp
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