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No problem mobybrz. Really I was just pointing out the tests could be useful if that is your only means to test a change, just be very careful with results as there are so many variables at play. I actually enjoyed the link to the article about the closed tunnel so thanks for posting that.
EarlQHan, totally agree. If I had to pick between traction and drag for that discussion of the wheel/tire combo, I would care much more about traction and weight change. Last, I would care about drag increase of wheel. RPF1 wheels (15-17lbs) of any normal size for our car are much lighter than OEM wheels (20 lbs).
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