Tyre manufacturers go to great lengths to produce uniform and round products. However with any multi component products often small mass differentials around the circumference are inevitable. To equalise these small deviations it is necessary to have the tyre and wheel unit balanced following tyre replacement. Unbalanced tyre/wheel units will cause vibrations to be felt through the car‟s steering wheel and / or through the vehicle‟s body leading to driver / passenger discomfort.