I believe it also has to do with the type of bike one buys. If perhaps something from the 50's or 60's riders tended to ride larger frames with saddles just about 3 inches from the top tube. Newer bikes in contrast have trees instead of seat posts :) I tried riding a smaller frame 80's bike and found that classic campy seat post are not quite made long enough to accommodate my long legs and small bike frame. Though this was easily solved with a current day long seat post, if I wanted to be period perfect I'd be stuck. So summary. Very old bikes, perhaps run them large and enjoy how they were meant to be. 70-80's bikes can be run at what is referred to as the Eddy fit
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