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WimVDD
@Fignon
Here is my Colnago Master Olympic circa 1993.
It has a dropped top tube otherwise known as 'Freuler' geometry which was termed after Urs Freuler a Swiss cyclist on the Atala team during the 1980s who had his frames constructed in this way. It is a true 'Freuler' because both the seat and head tubes extend upwards past the normal junction with the top tube.
The seat tube is 59 c-c and the head tube is 19cm which is consistent with my usual 61 x 59 x 19 however the junction between seat and top tube is 58 c-c.
The thinking behind this approach is to give frames over about 60cm improved stiffness in the main triangle.
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