There are many rotating items in a car's drive train, which can cause
vibration. Each part has its own range of natural frequencies. If a natural
frequency is excited, the part causes the greatest disturbance as it vibrates.
Engine vibrations occur at the highest frequency, many hundreds of vibrations
per second, & cause a buzzing or humming sound. These vibrations are felt in
the floor or dashboard. Tire & wheel related vibrations occur at a much lower
frequency, typically 10-15 times per second. This results in the 'shake' most of
us have experienced. Even a small amount of wheel imbalance can translate into
NOTE: Do not ignore apparent impacts,
pulling or vibration. These may be indicators of tire damage as much as
mechanical problems, requiring expert inspection.