Fixed gear bikes have track Fork Ends, unlike other bikes that can accomodate gearing systems.
Geared frame convert to Single speed can, with the addition of cog spacers & chain tensioner. See my marketplace bike for sale.Single speed/Fixie frame do not have the dropout to mount rear derailleur & frame has no lugs to route cables for Front dérailleur. Some Fixie frame/fork do not have recess to mount brakes.
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