Tire Noise

DESCRIPTION
If the road test indicates that there is tire whine, but not shake or vibration, the noise originates with the contact between the tire and the road service. A thumping noise usually means that the tire has flat or soft spots making a noise as they slap the roadway. Tire whine can be distinguished from axle noise because axle noise diminishes or changes according to load or speed. Tire noise remains the same over a range of speeds.

CAUTION: Be sure to deflate tires to their proper pressures after this check is completed.

To verify that tire noise is not associated with shake or vibration, over inflate the tires one at a time and check for a change in the sound. The pitch or whine will change as the increased pressure changes the tire frequency.