My 2007 Passat makes "rotational: noise whern I turn right

[infotrad]

At first I thought it might be a tire. But I hear the same noise with winter tires and new summer ones. The noise seems to come from the front right when I turn the steering wheel, even ever do slightly. I don't hear it, or rather, it goes away, when I turn left, because I can still hear when going straight. It's louder when I turn right. I hear it most clearly on smooth pavement at least 15-20 MPH. Even when going straight I can hear it, but when I turn the wheel even a millimiter...the noise appears. And the noise is what I would call "rotational" because its frequency is proportional to the speed of the car. Also, it makes no difference whether the car is in neutral (it's an automatic) or in gear... I visited two VW dealers and they seem reluctant to even check the the CV joint or bearings... But before I get tough with them, I would like to know more about how such a noise could appear in the first place. Any ideas?