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purpose. Obviously you need a dial indicator rigidly mounted to read variation in rim rotation as the wheel is spun. The two tire places that I went to had some pretty sophisticated balancing equipment on which a wheel can be spun, but no precise way to measure runout. They just eyeball it and guess about how much is too much. Since this is a spec that appears in the FSM, maybe dealerships can do it. Afterall runout is a concern in brake rotors as well.
 Chance favors the informed |
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