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.
The most common cause of tire separation is contact with a curb or pothole. The layers of the tire get pinched, and air inside the tire gets between them. Essentially, the tire isnât totally round anymore and causes a vibration. The separation can be a safety concern as the tire is significantly weaker at that spot. A lumpy driving feeling at low speeds progresses to a fast vibration at higher speeds when a tire separation occurs.