A British thermal unit (Btu) is a standard unit of energy that is used in the United States and sometimes in the U.K.
There is another defect in tires that can cause a vibration called loaded road force variance. The tires and pass a visual inspection, a radial and lateral runout test, be perfectly balanced, but still cause a vibration. This is due to the internal defects in the tire.
If your car shakes while driving down the road or the steering wheel vibrates, you're not alone. One of the most common complaints of vehicle owners is vibrations. Whether it from the car tires, bent rim, or the brakes, they can be annoying and if left unattended for a long time, it could cause premature wear and tear on the tires and suspension. Most vehicle owners think that when their car shakes or vibrates, it means they need and alignment, this is not true.