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The number of revolutions per km for a free rolling tyre are less than that calculated from its static radius. This difference in number of revolutions is due to

[A].	forces in the contact area that cause slight forward of the tread	[B].	hysteresis of the tyre materials which make the dynamic loaded radius somewhat larger than the static radius
[C].	either of (A) and (B) above	[D].	none of the above

Answer: Option C

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