Mysterious tubing

[jsuomine]

What is the tube of frame? The tubes have low 0.5 mm groove what shown in the pictures. The seller said that tubes are in Columbus Zona. But I have not found anything like it on the Internet. Frame was buy directly on the French columbus distributor. Is this frame some prototype or what?

 

[Spear45]

Hello, Colnago used to put ribs in their Columbus SL frame sets in the 80's. I had a Colnago Master with the gilco,square tubing from the same era,the seat lug looks similar.

 

[Midlife]

My Moser Leader AX with Oria Tubing has that sort of appearance....... well sort of.

Shaun

 

[jsuomine]

Yeah, the ribs looks like Oria tubes.

 

[Stempie]

I believe Columbus did something similar with Cromor tubing, but their ribs twisted around the tubing.