Car Makes a Humming Noise

If the noise was there before the tire rotation, there is the possibility a wheel bearing is going bad. If the noise started after the tire rotation it is most likely from the tires. Sometimes rear tires can get a little choppy on the inside edge. When rotated to the front of the vehicle the noise from the tires can be more noticeable. This is something a certified shop should look at. Faulty wheel bearings can be dangerous and possibly cause more damage. It is better to be safe and have the problem looked at.