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Just an FYI:
There's been a lot of work about measuring RR in car tires in advance of regulations requiring publication of said RR values. One of those things is the difference between testing on a wheel vs a flat surface (rolling road). The result was that there was a very good correlation between the values. I can't seem to find the study on the internet, but I have notes from a conference I attended.
In other words, when it comes to testing RR in car tires, it doesn't matter whether the tires are tested on a flat surface or a large diameter wheel, the values are proportional.
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