Auto Wheel Bearings can Fail
Wheel bearings come in a variety of designs.The most common symptom that a auto bearing is on its way out is a roaring noise that will increase with an increase in vehicle speed. To identify which bearing is the culprit auto technicians will frequently use microphones to examine each bearing whilst under load. Even if you haven’t got this specialist equipment the problem bearing can be identified by listening very carefully.
This video shows the difference between wheel bearing noise and tire noise, wheel bearing noise sounds like a low growl, and a tire with flat spots will slap against the pavement.