Hot answers tagged road-bike
It seems like the first question to answer here is: freewheel vs. cassette. The, assumed, age of the wheel and being a 6-speed does suggest that it's a freewheel. However, even if it is an original wheel from the late '70s it is not out of the question that it could be a cassette (at least according to Wikipedia). Looking at the parts, I see several clues ...
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