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@pajamas
I thought I might find answers on an old thread http://www.londonfgss.com/thread1450.html
but the columbus tubing chart isn't coming up for me from the link supplied - has it moved? also the columbus website is more about now than vintage -
so I thought maybe it might be useful to start pooling our knowledge about Columbus, steel at least, seeing as there are lots of juicy variants? anyone up for trying to grade them, in terms of quality or use/appropriateness? I think it would be a useful thread.
As a start there's a link I found to a 2003 web page for a frame builder.. http://www.terrafermacycles.com/tubesets/columbus/columbus_tubesets.htm
by the way Max your "Zona" is listed here..