<E28> Wheel bearing worn?

["Gilbert, Clark" <Clark_Gilbert@xxxxxxx>]

Since replacing my TRX's with 15in wheels and tires last weekend, I have
noticed a new noise - probably there for a long time, but the roar of
the TRX's covered it up. There is a roar from the front that seems to be
a twice the frequency of the wheel rotation. It's only noticeable at
speeds below about 30 mph. Also, it goes away when I go around a
right-hand curve. I think I need to replace my front wheel bearings. Any
other suggestions or trouble-shooting hints? 

TIA
Clark
87 535is, 129K miles

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