Very Easy Cadence Meter For Your Bike <$12

Step 4 Remove Magnets

I lucked out finding a pack of
5 which you use all of them on
a road bike.

On a Mountain bike you can use
4 due to the difference in the
crank.

I removed the magnets by cutting
around the outside of the magnet
with a knife. Be careful, you
don't want to pry on the magnet
and break it.