2005 Focus zx5 with 37000 miles. I get a loud roaring noise from the back tires and I just replaced with brand new tires and it did not fix it. Sounds like the car would have mud tires on it. Could this be the wheel bearings? I have an '01 Focus and know it should not be this loud. I jacked the car up and tried to move the tire to see if they had any play and they do not. What should I do?