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I am not saying it would be useless, only that with all those variables simultaneously in play you might draw erroneous conclusions. Besides the external elements, if the car did appear to have more drag but the wheel tire combo was lighter than oem, was it more drag of the 9" wheel or the weight change affecting inertia? On the flip side, if wheel tire combo had what appeared to be less drag and it was heavier was it due to weight or drag. See what I mean? And you might have in reality more drag on that wider wheel, but it actually appears to have less overall drag because the weight is heavier and having a more dramatic affect on the test (inertia versus drag) on proposed coast down from speed test.
Your article about the tunnel actually supports what I am saying. It is a very controlled environment.
The original person that asked about this was not talking about a static car. u/Josh was asking if the proposed road test would be ok to determine drag difference of using a wider wheel.
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