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I can understand that if you want to know the RRC for all tires you have to test every model in every size as it is known RRC will vary with width and profile.
However, I don't see why exactly that is a problem. I mean measuring RRC is not rocket science. I don't see why they can't come up with standardized test equipment giving repeatable results. Every manufacturer gets the same test bench and make their own measurements and publicize the results. The regulating body then randomly pick samples and performs a couple of tests to validate the results, and that would be sufficient.
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