Originally Posted by
Oldtimer1940
Just to clarify, your post and the one by vjp just above yours seem to have a different opinion on chainstay crimps or no chainstay crimps. My bike does have chainstay crimps. But I am still not sure what conclusion that leads to. At this point it is just curiosity. Mexico or Super? not vital, but I am curious.
When the Mexico was introduced one feature was no chain stay crimps for tire clearance.
Much later the Mexico, aka Nuovo Mexico got "Gilco" crimped top and down tubes.
Allegedly the avoidance of crimping was to keep stress risers away from the thin chain stay material...
Maybe the crimped main tubes were done before heat treating... Select your urban legend.