Dynamic imbalance is caused by an asymmetric mass distribution inside and/or outside of the rim. The asymmetric mass distribution is only visible during movement when the forces work in different directions and cause the wheel to hop or wobble. To determine a dynamic imbalance the tire/wheel assemblies can be checked on a balancing machine.
The dynamic imbalance can be compensated by applying wheel balance weights on the outer and inner side of the rim.
In addition to dynamic unbalance, there is also static unbalance.