I had a flat two weeks ago and had to be towed because the tire wouldn't hold any air. The tire shop looked at it the next day and blamed the issue on a buildup of corrosion on the rim (all of which are factory). They told me they cleaned the rim again, and remounted the tire without any problem. I picked it up the next day because of the tornados in the area, and drive it home..noticing a new road noise from the passenger side, seemingly from the wheel/tire that was the issue the day before. It sounds like mud tires on a pickup, and changes pitch/volume depending upon the speed of the car. Usually begins to be noticeable around 25mph. No other signs or symptoms at this time, just the sound.