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Dynamic Balance
The discussion up to now has really only discussed balancing tires on a static or bubble balancer. The most common type of tire balancing used today is dynamic or spin balancing. The easiest way to imagine how this works is to think of the tire as if it were split right down the middle of the tread. Imagine having two saucer shaped pieces. The dynamic or spin balance machine balances each of those halves or “saucers" separately. That is why the typical spin balanced tire will have different weights at different locations on the inside and outside of the wheel. The static or bubble balance is a combination of both saucers, dynamic separates the two pieces.
Spin balancing is regarded as the best way to balance a tire and wheel assembly
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http://www.intercotire.com/site40.php