The damping factor kD is an important parameter for characterizing a tyre, it depends on the velocity (v large >> kD small >> FRflex small)
Tyre damping tests at different rolling speeds have shown that damping decreases at an increasing speed.
At increasing speeds, the effect that lowers the flexing resistance is superimposed by an opposite effect: the deflection of the tyre rolling under load in the contact patch causes the tyre circumference to vibrate beyond the contact patch as a result of forces of inertia that increase with speed. The damping of this vibration produces heat which results in an increased flexing resistance.