Fritz  has left a new comment on your post "Traffic lights and bicycles: The technical explana...": 
 I asked Bob-the-traffic-engineer. According to him, the wheel material is the important part, so metal wheels should be fine. If your friend has carbon wheels, though, he's out of luck.
For carbon wheels, Bob suggests winding a thin insulated copper wire around the rim (under the tire) a couple of times and splicing/soldering the ends together so it makes a continuous circuit. 
  
 
 Posted by  Fritz  to  Cyclelicious at  10/11/2007 11:17:00 AM 
 
