So sothe tyre manufacturers account for this when they give you a wrpm
figure?
In a message dated 19/10/2008 04:30:42 GMT Daylight Time,
dlh2001@comcast.net writes:
I disagree. A tire does grow in diameter as a function of the square of
its rotational speed.
The steel belt limits this, but not as much as you think. Basically the
sidewalls move inward
and the center of the tread goes outward.
The growth is not much, but it is enough to impact the final drive/rpm
calculation.
Tire Growth Factor = 0.000100 (Inches/(MPH*MPH))
so for 50 mph 0.0001(50*50) = 1/4 inch increase in diameter.
The above formula is probably generic, different tires probably behave a
little different,
but they will all grow with the square of the rpms.
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