On my 17 i noticed that it now has a high pitched buzzing in the bars and foot boards,not a sound but a feel,it will make the mirrors look a little fuzzy. I checked all the engine mounts to make sure nothing has worked loose and they are all tight. The only thing i have done was to have a Avon Trike tire installed over the winter. Checked the air pressure and its good.Has anyone else had this and if so did you ever track it down.I have yet to jack front wheel up and check wheel bearings but that is next.