Three of four tires purchased have shifted belts which cause my car to shake badly above 50 MPH. I have spent hundreds of dollars having the entire suspension inspected and realigned several times at different shops, tires rebalanced, the last shop discovered the source of the vibration, the new tires. You can watch the tread shift side to side while they are spinning on the balancing machine. Rims are straight. The problem didn't manifest until late spring, several months after installation, much to my surprise.