I get a fair amount of requests to appraise vintage Colnago roadbikes,(which is always a pleasure), and amongst those fine steel steeds have been a number of questions regarding the Colnago Nuovo Mexico model, (circa 1983-4 )
More often than not the owner has one of these, which were more common, the Colnago Super (profil), which can be identified from one crimp either side and center on the top tube, one either side and center on the down tube, and inside the chain stays
a Colnago Nuovo Mexico has two crimps either side and center on the top tube, 2 crimps off center either side of the down tube (so dt has 4 crimps in total!) , and none inside the chain stays…
This example is Mr ‘ Beppe ‘ Saronni’s Del Tongo Team circa 1982 Goodwood winning Super….
You can see it has one rib on the top tube ( one either side , two in total)
And only two ribs on the down tube , predating the circa 1983/4 release of the Nuovo Mexico with 4 down tube ribs located off center …
This is a circa 1984 Super ‘profil’ , same era as the Nuovo Mexico was launched ..
This frame is the same age and colour , but is a Nuovo Mexico
Two ribs in the top tube ..
And 4 off center in the down tube
this is a later , circa ’85 Nuovo Mexico , able to ‘ date ‘ it as later than 83/84 because of the rounded , Colnago stamped seat stay caps
Recently on Facebook , a renowned USA Colnago retailer with a long history and rapport also confirmed the factory model is a Super …link to the comments here