Some models of vehicles are more vibration-sensitive than others. If a vehicle has a confirmed vibration issue (See Vibration Diagnosis Service), a "Match Mount" may be required when a regular re-balance isn't getting the job done. As the Wheel and Tire are not perfectly round we have to measure the two pieces independently. After we measure them, we reassemble them with the high spots opposite of each other, minimizing the "Egg" effect of the rotating mass.
The benefit of a vibration free ride and longer tire life is realized with the Wheel and Tire roundness being optimized.