If it has to be a cog to go on a freehub body then chop up a cassette? Single cassette cogs might be a bit narrow based if your freehub is ali but at that size there'd be plenty room to do something like sandwich a couple smaller cogs around the big one, drill a few holes through all three cogs and bolt them together.
If it has to be a cog to go on a freehub body then chop up a cassette? Single cassette cogs might be a bit narrow based if your freehub is ali but at that size there'd be plenty room to do something like sandwich a couple smaller cogs around the big one, drill a few holes through all three cogs and bolt them together.