to the OP:
freewheel, goes on a threading, for anything less than 16t you will need a bmx hub with smaller threads: cog/sprocket. goes on a freehub with spacers: what do you need?
@deleted started
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to the OP:
freewheel, goes on a threading, for anything less than 16t you will need a bmx hub with smaller threads:


cog/sprocket. goes on a freehub with spacers:
what do you need?