| Q. |
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 |
| E. | None of the above |
| Answer» C. either of (A) and (B) above | |
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