Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
If the magnet isn't hitting something I can't imagine what the source of the sound could be. Generally, bike computer pickups have a little reed switch inside of them that you can barely hear if you spin the wheel while the bike is on the tuneing stand. I wouldn't think that would be nearly loud enough to drive you "nuts".