I have a 97 Mystique that I bought with 38,000 on it. When I bought it it had a tire hum sound, so I replaced the tires with some generic brand and the sound went away for about 1 month. I then replaced the wheel bearings and had a 4-wheel alignment done all to no avail. I put up with the sound for a year and then replaced the tires with Michelin Pilot XGT's and now the sound has been gone for several months.
