Static vs. dynamic balancing. Properly done, tire balancing will give even tire wear, vibration control and good handling characteristics. Improperly done, this will mean tire replacement before it’s time because of uneven accelerated wear, excessive vibration causing improper road surface contact and a bad handling machine with it’s own mind, especially at high speeds. Bubble or static balancing is old technology and only demonstrates a poorly equipped shop. This type of balancing is done at rest and ensures the tire will not stop in the same place twice in a row but will come to rest in a random position.


Source: http://www.heavydutycycles.com/techtip1.htm