Thanks for the reply...the one I listed in the post has that strange large black ring on it (why the difference?), in your estimation, will the freewheel allow for smooth shifting. I do not know what freewheel was on there originally, any ideas what it might have been if I want to find an original one?[/QUOTE]It would have originally had a very similar one, but without the black cog. The black is just marketing/advertising. You're not going to have much choice for equipment that dated, unfortunately. I tried a quick search for Hyperglide 6 speed freewheels (which would shift better) but only found an off-brand - https://www.google.com/search?q=sunl...17143638901023