Im almost 100% sure it is the bearing. Feathering usually comes on slowly and has more of a howl. This is more of a grind that onsets very suddently above 30mph. I used to have tire feathering with my 350Z until they did a TSB on it. THis is a much different sound. Once I get above 70MPH I can hear the resonating wom-wom-wom sound.
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