Tire Balance Off...But At Low Speeds?

[XanderWiFi]

I have been experiencing something strange lately. I am getting a steady "whum, whum, whum" sound that correlates with the speed. I have also discovered that the car will shake as though the tires are out of balance but at around 28 mph. Feels almost like it rocks the car from side to side.

Mechanics said the tire has some uneven wear, but subtle enough that it would be noticed at high speeds. Replaced both wheel bearings. I am thinking a balance and rotate but the speeds relating to the vibration just don't seem to add up...I have only ever experienced off balance vibration at higher speeds.

All this after finally getting the shoddy suspension job corrected. It has been aligned and drives straight as an arrow flies.