Originally Posted by
Notso_fastLane
You could put a couple of the magnets on opposite sides of a wheel. I bet that would work.
It gets the magnet right down there near the street level. It would simulate a significantly larger hunk of metal. I have a small (20") front tire on my recumbent, so I could easily roll a little forward or backward to make this work. I'll have to try it.
The wheel works so well by itself that it doesn't need enhancement.
Here's a full on geeky version of why. About half way down the page.