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@ObiWomKenobi
I don't think tooth profile should even be discussed, as there's even differences between freewheels like:
http://www.tontacycles.com/wp-content/uploads/2012/06/SDC18097.jpg
and
http://www.bmxinternational.com.au/Uploads/Suppliers/BMX%20International/Images/8AAAFCD8-05B1-4BE3-8496-21D21F45BE2B.jpg