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Re:
The old school frame sizes were measured along the seat tube from the center of the BB to the top of the top tube/seat tube joint. Most frames today are still designed similarly, except for the sloping top tube and longer seat posts to allow for the shorter seat tube. So frame makers had to change the measuring system to allow for the slope. Frames now are sized by the top tube length measured from the center of the seat tube to the center of the head tube.
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