I own a 2005 Suzuki Forenza with 42k miles. In the past month I’ve noticed considerable road noise. The dull hum is loudest when I reach 60 mph. I thought it was tire wear, but my all-season tires are only 5 months old with 8k miles on them. I rotated them just the same, but the noise was still as persistent. I returned the tires to the retailer and put on brand new all-season tires, and road noise was still persistent. Also, the noise is unchanged whether accelerating, deccelerating, or coasting at 60 mph. Any clues?
Wheel bearing.