Profile: Courtesy Auto Service and Tire of Tacoma offers a full and complete line of auto repair and maintenance services for car & light trucks. We can also service light commercial vehicles. Wheel balance refers to the proper distribution of weight around a revolving tire and wheel assembly. Proper wheel balance ensures that the wheels, while spinning, do not have a heavy spot that can cause vibration and premature wear of tires, struts, shocks and other steering and suspension components. Timing belts keep crankshafts, pistons and valves operating together in proper sequence. Timing belts fail without warning. When this happens the engine will stop running and serious engine damage will occur. On some vehicles the timing belt drives the water pump that cools the engine.