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How: The low tech way: Measuring tape Simply take it with you and measure five bikes that are comfy, and five that are not. Digital camera Ask someone take a picture of you sitting on the bike, then review the picture to analyse yourself the sitting positions, both those that feel comfortable, and those that feel uncomfortable. Geometry: Chainstay. ...


If you look at the full resolution it is clear. BS is center to center (head to seat) along the (sloped) top tube. Since the seat tube is slanted that is a shorter distance. Geomemtry C2C Cathetus and hypotenuse apply to a right (90 degree) triangle. There is not a 90 degree triangle on the BS.

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