Bought a slightly used car 1 1/2 yrs ago that was "certified used". Part of that deal was brand new tires of my choice as long as the tire shop the car dealer used sold them. After research I chose pricey ones sold by the people with the blimp. Almost immediately one started thumping. I imagined the sound Just like in a cartoon picture with a bandage wrapped around the tire. My wife went back to the dealer 3 times as time went on and complained and they kept rebalancing and rotating using various tire machines in their several different brand dealership shops. The last visit was finally to the tire dealer of whom I never liked. They insisted it was a wheel bearing. Well, I finally took it MY tire guy of whom doesn't sell this brand but he agreed to look at it. Both back tires have ONE flat spot clearly visible to the eye. The spots do not line up with the seam of the carcass, either. He says in all his years the only thing that will make ONE flat stop is a panic stop slide. This car has NEVER been slid! So what gives? I don't think I will get anything out of the tire dealer since they now have some miles on them.