Step 5Place Magnets
chain ring.
I used 5 so the spacing was even
around the crank.
You can use 4 on a Mountain bike.
If the magnets are fairly strong they
will stay put, but they did move when
they were hit with the hose. Be careful not
to get water in the BB when you wash your bike.
If you have aluminum chain rings and bolts you
will have to glue them on. I used rubber
cement on mine anyways.
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