It is important to check to see that the wheel and tire assemblies are in balance before aligning the vehicle. "Static" balance is the equal distribution of weight around the wheel and tire assembly. "Dynamic" balance is the equal distribution of weight on each side of the vertical centerline of the wheel and tire assembly. "Unbalance" (or imbalance) exists when the weight is distributed unequally around the horizontal axis of the wheel and tire assembly. Unbalance can exist in the tire, wheel, brake drum or rotor, or even in the hub. It also occurs in any combination of these components. Unbalance can be detected with the aid of special equipment, which usually indicates the proper location for wheel weights to restore the proper balance. Even with regular maintenance, however, uneven tire wear can result from drivers' habits, such as side wear from excessive cornering speeds. To counteract uneven wear that leads to unbalance, the tire industry recommends that tires should be rotated every six to eight thousand miles.
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