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Re:
As I recall, using a then-standard 42/52 crankset, the derailleur should have a cog size limit of 28 teeth. Any six-speed freewheel should work. If a seven-speed freewheel will fit the hub and frame spacing then it should also work but may require a thin profile chain like the Suntour "Ultra" line or popular "Sedissport" chains of the time. I'm not sure if a more modern 8-speed or 9-speed chain would work because the chains may be too narrow to fit over the cogs of a freewheel.
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