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.
1 Have a tire shop check and rebalance your wheels. 2  An off balance wheel can cause lots of vibration. 3  This is a cheap fix if it's your problem. 4  Replace your shock absorbers or struts.