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@pajamas
some more info for future users before we get bogged down in the whole tretubi / air stuff.. this is the breakdown of the tubing Columbus offered around the late 80s:
Max - Tube with oval profiles oriented according to the principal axes of the active and passive stresses. Intended exclusively for special competition machines
TSX - for high level professional use. Maximum rigidity and low weight. Reinforced with five continual spirals in addition to the traditional Columbus varied wall thickness
SLX - "Superbutted" (helical reinforced ends) for professional uses. Double Thickness butting.
SPX - "Superbutted" (helical reinforced ends) with increased thickness, for professional uses. Double thickness butting.
SL - High performance all-purpose road race set. Double thickness butting.
SP - for heavy use, large frame or rough road surfaces. Double thickness butting.
MS - "Multishape"; special "Gilco Design" set with different profiles: each tube is shaped to withstand specific stresses. Professional use. Double thickness butting.
Cromor - for enthusiasts requiring excellent performance at a moderate cost. Double thickness butting.
Aelle - For amateur touring uses. Lightweight thanks to the thin tubing and high yield point.
These were taken from a back page Columbus ad from a 1988 cycling mag, so the info is probably a translation from the standard Italian brochure.. I'm saying that cos of course they're not going to say that Aelle is lower end etc... there are a few more but they're off road and tandem tubings, "Tandem CM" for track use, "Tandem CR" for touring.