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Old 12-27-19, 04:59 AM
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hokiefyd 
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Bikes: 2018 Giant Roam 2, 2018 Redline Zander, 1997 Trek 750, 1970 Peugeot UO-18

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The numerical size is the measurement (in inches) of the seat tube, from the center of the bottom bracket to the top of the seat tube. My '97 750 is a 21", and the seat tube measures exactly that.
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