I have a 2003 Sentra with 100K miles. I'm using American Goodyears and rotating them every 10K miles. I feel no vibration or bouncing while driving, the only thing I hear is tire noise. The tires are "wearing" on the inside track of the tire. I say "wearing" but it's not limiting the tread life of the tire, just creating a wave pattern in the inner track of the tire. All four tires are like this. I went to various shops and this is the consensus: 1. Rotate them more often. I don't believe this one as 10K rotations seem fine for how much highway driving I do. 2. Balance the tires more often. I don't believe this either as I feel no vibration when I drive. 3. Alignment is off. Hard to believe this one or the whole inside track of the tire would wear evenly, not in a wave pattern as it is. 4. Bad shock/strut. I guess I could believe this one but I feel no vibration or up and down motion while I'm driving. 5. Defect Tires. Hard to believe this one as well because the factory tires did the same thing (just maybe not to the same degree as the Goodyears). I don't have a money tree in my back yard where I can't have new struts, shocks, or alignment done to hopefully fix the problem. What do you think might cause that wavey condition on the inside track of my tires? I can see the waves as well as feel them when I run my hand across it. Thanks for the input.