[RICK LAKE]

UKjohnnycobra If the tire has a flat spot, even balanced, the faster you go the worst the vibration should get. It should not be in a narrow mph range. Putting the car on a lift and going through the rpms should show something if the tire is out of round or the drive train. Keep the speed to only where the problem is. You could damage the rearend on some cars when you have the tires hanging. You could have a driveshaft angle problem, an unbalanced rotor for the brakes, Go to a good tire store that can do a force test to see how far out the tire is of spinning true. If it is in spec, you are looking at the drivetrain for the problem. I am going under the fact that the tires are new and the rims spin true on a machine. 90% of the time a new set of tires fix the vibrations. Could be a belt shift inside the tire too. The tires will still balance up OK and zero out, but you will get a vibration. You feel this in your A$$ not your hands. Rick L.