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Originally Posted by CapriRacer
... Since the rated load on a tire varies by tire size, this is usually expressed as a percent of some value in the load table. Larger tires will have more load than smaller tires, but the way it is calculated would be the same.
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So what you're saying is that tires of different sizes are being loaded with different loads (as expressed in lbs of force), because those are the same percentage of the load value in a table somewhere.
OK, that makes sense of the results--one of the assumptions I was making was invalid, so my reasoning fails at that point.
Quote:
You should also be aware that RRF varies by inflation pressure - and to my knowledge, no one has developed a formula that covers every tire to account for changes in inflation pressure.
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True, but a limited number of examples tested have shown us that RRF drops as pressures rise. The relationship is non-linear to be sure, but it does seem to be monotonic in the range from typical placard pressures to the sidewall pressure. It's definitely not a complete model by any means though, and it is quite possible that there are exceptions.
Anyway, thanks for clearing up my understanding of the data!
-soD