I don't remember seeing this mentioned. I'd like to find a French made cog to fit my English threaded Normandy hub. Am I looking for something that doesn't exist? Did Atom, Cyclo or Maillard make any track cogs? If someone has one please let me know so I know such a critter exists. A source is good too! I've seen one speed freewheels on ebay but not cogs. Thanks.