Since rotating the wheels on my 94 Corolla (front to back and back to front) there has been a bad vibration once the speed reaches 80kph (50mph). The vibration is NOT felt through the steering. Even passengers can feel the vibration. I have had ALL wheels electronically balanced TWICE with little improvement. I also rotated the wheels BACK to their previous positions without any real improvement. I raised the front wheels off the ground and ran the wheels up to
80kph and could not detect any vibration but DID NOTICE that there appears to be a high spot on one tyre (when you hold your finger near to the outside tread one section of the tyre touches my finger during rotation. Could this (high spot) be causing the vibration? Can a high spot develop over a very short period of time? How bad does a high spot need to be before it can be felt as a vibration? Could there be any other things which could be causing the vibration? Thanks John