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EP,

'Rumbling' is one of the most frequent descriptions of the sound a wheel
bearing makes. They're a bit hard to diagnose, except that if you veer
slightly to the right, the left side will rumble louder, and vice-versa,
because the car's load shifts. Apparently the modern sealed ones can be
noisy for YEARS too, and not change much. I'm no expert.

Maybe you should do a group or Google search for 'wheel bearing noise'
and see what you find?

'curly'