Originally Posted by
AKTed
Yep, basically silent. I sometimes think I can feel a very faint buzz. I also cannot tell a difference when the light is on or off.
Some people have complained of a faint vibration at certain speeds, possibly from a resonance in the frame from the armature going past the magnets, but I have never noticed that on my bike. The comments that I have seen on that was that it was felt on the hands, but I have never seen reference to a noise from it.
When you first get your new dynohub, it is common to think that the bearings are adjusted wrong because by hand it is hard to turn the axle. But that is a function of the magnets, once the wheel is installed it rotates fine. So, do NOT attempt to adjust any bearings.