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Econoram, I know several times in these threads I have stated that the results (taller tires lower rpm) tend to apply to cars more than trucks.
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Also, the results are pretty accurate when ONLY increaseing the tire diameter and staying w/ the stock wheel.
But When going to plus one and plus 2 rims, the problem becomes moving the mass/weight of the tire/rim combo farther out.
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Not sure bout the 1 lb equaling 10 lbs comment.
All the outside data and reports say 1 lb static (still) weight is equal to 4 lb rolling. Specifically on tire/rim weight.
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