The tubing was normal round shaped tubing. It was squashed with a mandrel and made into an aero shape by Pinarello. Several builders did this in that era.
Columbus AIR used unique lugs, bottom bracket, and seatpost. That was too much trouble for most builders.
Reshaping regular tubes but leaving the ends round allowed builders to use their own frame parts. That beautiful bottom bracket shell on your Pinarello would not fit AIR tubing.
I'm not sure but I think ARCO84 was not a model name, but the Pinarello name for that colourway.
Do not expect much from Pinarello. Despite all their success they have surprisingly little interest in their heritage, and are mainly concerned with the here and now, or next. Go to Colnago's place and they have a big room full of special bikes from their past. Go to Pinarello and they have a few Tour winners up on a pallet rack behind boxes where nobody can even see them.
Last edited by Cinelli 82220; 03-03-2016 at 07:26 PM.