The best way to determine wheel bearing is to put on a different width tire eg usually 255 then switch to 235. It swaps the forces from toe in top to toe out top and swaps the forces on the races it will make a dramatic change in the drone. Since you don't know which way the wheel is being forced (in or out) it's impossible to know for example when you turn left or right, are you adding or subtracting force from the inner or outer race, but put a skinny wheel on and your are guaranteed to flip the forces. (I found that out the hard way when I lent my wife my 255s and on some 245 spares I had and instantly my car started to drone like a plane from a 1960s war movie. Change one tire at a time to the 235 spare and see if you get a dramatic change (quieter or louder).

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)