If the noise goes away at higher speeds, then its probably not a bad wheel bearing.

As an aside, I had a wheel bearing that seemed OK but rumbled like crazy. On closer inspection, I found a tiny nick on the surface of one of the races. That little flaw can make a real big noise.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma