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I show how to replace the freewheel on a bicycle wheel. I replace a worn Sachs freewheel with a new Shimano freewheel.

This is the Park Tool FR-1 tool that I used in the video. It’s actually the one I use most often.
http://www.amazon.com/exec/obidos/ASIN/B001B6RGXG/ref=nosim/rjthebikeguy-20
But depending on what freewheels you are dealing with, you may need a different tool.