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Testo: <blockquote data-quote="JesperJesper" data-source="post: 7312225" data-attributes="member: 152971"><p>You can measure the down tube diameter to determine if it is a "Spiral Conic" model. The diameter near the head tube is 28.6mm and near the bottom bracket it is 32mm. If your frame has those measurements than it is a "Conic"; otherwise it is not. Early versions had no flutes, later versions had a fluted down tube. Frame is late 80s to 90s. Cut-out on bottom bracket might help assisting in determining the year (s) of manufacture. Colnago Masters (Piu), Supers (even before the Piu model was introduced), Conics, I believe, all had internal top tube cable routing at that time (late 80s and onward); except '88 has guides below the top tube.</p></blockquote><p></p>