That, logically, could be the problem. The car looks for "Are the wheels spinning at comparable rates" and if they're not suddenly, it fires the traction control appropriate. If they're not all the time, then it won't be able to know reliably whether this is normal or a problem, and it would be perfectly reasonable for it to report a problem.-However, After my first tire was installed, I had to move the car. so I did have one out of four tires that was of a different circumference. Could it be just that ?