Quote:
Originally Posted by pete
Are you people taking the tire compression under weight into account..
12mm of compression make one hell of a diffrents to the running dia...
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Rotational inertia can often counteract the compression at higher rotational speeds, and is more prevalent on larger diameter wheels even with a slower rotational speed. The stiffness of the tire carcass also has an effect on this. My Shinko 705's are a much stiffer carcass than the stock knobby tires, and deform much less even at a lower pressure. Even if you took these factors into account it wouldn't change the outcome by more than one or two hundred rpm at most. His method of calculation is good for a general rough estimate at RPM vs. wheel speed.