Getting vibration on smooth roads at 60-68 mph. Put on 4 new Michelin tires, replaced brake rotors, balanced all tires, still experience vibration. Dealer can't fix. What are other solutions besides saying tires are out of round?

- Westerville, OH, USA

Tire blewout on highway for no apparent reason. Car had been serviced and tires rotated and checked several days earlier. A couple of tire dealers checked the tire and could find no evidence of road hazards. I still have the tire, but trying to prove it wasa structural defect I can see is going to be next to impossible. Cadillac covers all defective parts, but Goodyear says you can't prove the tire was defective even if there is no evidence of a puncture or hitting something in the road! your input and help is appreciated. (dot number: 1 6-000-12 tiresize: 235/60-16)

- Boca Raton, FL, USA

While driving all tires have failed, resulting in temporary loss of control at high speed, with the vehicle swerving a full lane to the right, due to various nail induced small leaks and valve stem failures, consumer was advised by technician that multiple flats is normal in high-construction, North scottsdale, this has happened 4 times- 4-26-00, 10-28-00, 11-27-00 and 3-11-01.

- Scottsdale, AZ, USA