I have a 2001 Chevy Blazer Xtreme. I started noticing a noise that varied in pitch witha the speed of the vehicle, but went away while going around a sharp curve. I was told it is probably 'feathered wear' on my tires. I took the Blazer to Big 10 Tire to have the wheels rotated and balanced and mentioned this problem. They found an alignment problem and corrected it. Since then, the noise has gotten progressively worse. I called Big 10 Tire and asked about this and was told that once a tire starts to get feathered wear it will continue to get worse until you get tired of the vibration and noise and replace the tires. This sounds like BS to me. Any opinions?