bought a set of 4 from the local Goodyear dealer. they balanced all 4 tires and did 4 wheel alignment.I noticed a vibration right away. brought the car back and they re balanced the 4 assemblies & told me my wheels were out of round. The vibration was significantly reduced but still shook the floor at 50mph. I took the car to a wheel shop & they put the worst wheel on the their balancing machine and I could see the out of roundness as they slowly rotated the assy. So, I'll be back at Goodyear today for a whole new set of tires and they won't be Goodyear Assurance Comfort Touring. If I have my say, they won't be Goodyear.