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Old 10-13-2011, 11:43 AM
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A programmer (Predator/Trinity) can be used to change the tire size in the PCM.

As far as going from 20" to 17"- lots of factors to consider, but the main ones are overall tire diameter, rim/tire weight, and rim offset (aftermarket rims). You can go from a stock 20 to a 17, keeping the overall diameter the same, and you'll have no problems.
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