I'm sure this subject has been posted before, but hey ho. It's been driving me mad, at road speeds above 40mph I experience a loud droning/vibration felt through my lid, (Arai Tour-X3). The vibes eminate from the peak of the lid and seem to be transmitted into my ears via the ear plugs, (No vibes when not wearing ear plugs!). Also when you lightly grip the peak of the lid the vibes go. No amount of screen height adjustment or altering the seat height/postion made any difference. Remedy - 60grams of stick on wheel weights stuck under the peak - job done, no vibes at all now. David.