Can any one explain what tire run out is? I bought some new front tires recently and the car developed a vibration. After jacking up the front and spinning the wheels, it's apparent that there is a flat spot on the tires. I go back to the tire dealer and ask him to true the tires, because of the flat spot and he calls it tire run out. He trues the tire and high speed balances each on the car, it's better but not great. Did he do the job right. If any one understands the proper procedure for trueing, can you explain it?