use the search. there is no way for us to know whether or not you will need spacers as we don't know your chainline. measure your chainline at front and rear, then get spacers if needs be. a lockring has reverse thread.
google "fixed gear lockring"
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use the search.
there is no way for us to know whether or not you will need spacers as we don't know your chainline. measure your chainline at front and rear, then get spacers if needs be. a lockring has reverse thread.
google "fixed gear lockring"