Originally Posted by Mad Honk;21857163[b
]I suspect this is from an early threaded freewheel that accepted 3/16" chain[/b]. I would stay away from trying to use it as a track ring, it may do more damage than good. Track rings are available elsewhere,I would send it back to the seller. Smiles, MH
That would make sense. The freewheel body would be steel, so fewer threads would be needed.