Quote:
Originally Posted by cfg83
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I am getting the same results...........
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If you look carefully, you've got a very slight downward trend.
Quote:
Originally Posted by cfg83
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This implies to me that the tread depth isn't as important as I thought.
QUESTION: Would it be fair to say that "young/deep tread depth" just compresses? It is a form of (synthetic) "rubber", after all.
In any case, me still happy,  .
CarloSW2 |
Perhaps this will help:
If you go to Tire Rack, you'll notice that in their tire specs,there is both a column for Overall Diameter and one for Revoultions per Mile (RPM). This seems to be redundant, but if you do that math, you'll find that the 2 values are off by 3%. In other words, RPM value is related to 97% of the diameter, not the full diameter. This varies somewhat from tire to tire, but the rolling diameter is not equal to the measured diameter.
Why?
The best explanation I have heard is that the true rolling diameter occurs at the diameter of the steel belts - and that the steel belts act much like a tank track, in that it hardly matters how much rubber is on top of the belt, the length of the belt (or the length of the tank track) determines how far the vehicle moves in one revolution.
So you shouldn't be surprised that the speedometer doesn't vary much over the life of the tire.