[Uniformity] Radial Force Variation

Radial Force Variation is a property of a tire that characterizes the dynamic behavior of forces generated (such as steering, traction, braking, and load support) between a vehicle and the road surface.  As the tire rotates, the spring elements of the tire make contact with the road surface and are compressed. As each individual spring element rotates out of the contact area it recovers to its original length. Variations in the effective stiffness of each of these spring elements result in radial force variation. The change in effective stiffness and therefore forces generated is due to variation in the thickness of the tire and variation in the elastomeric properties of the tire.


Once the tire is inflated, loaded, and rotating, the radial force becomes periodic. There is only a slight difference in radial force variation when the tire is rotated in either direction.



Radial Force Variation