That "SL Competition" you are talking about is actually Columbus KL tubing. It's the specs. you quote. I have a few of them in stock.
La Mesa, CA
Has anyone heard of Columbus SL "Competition" tubing?
I have a slightly OT 1984 Gitane Team Pro frame (a "team replica" of those used by LeMond, Hinault and Fignon). It has Columbus decals in French.
The bike looks similar to this one:
The 1984 Gitane catalog specs list the tubing as Columbus SL "Competition". I haven't weighed the frame yet but it sure feels light and the tubes have the same kind of ping when tapped as Reynolds 753.
I've only seen 1 or 2 references to Columbus SL "Competition" and one list of tubing specs that has 2 different wall thickness dimensions for Columbus SL tubes.
Standard Columbus SL:
Top 09/06/0.9 Down 09/0.6/0.9 Seat 0.6/0.9 Head 1.0 Forks 0.9 Chain Stays 0.7 Seat Stays 0.7 Steerer 2.5/1.65
"Lightweight" Columbus SL"
Top 0.7/0.5/0.7 Down 0.7/0.5/0.7 Seat 0.5/0.7 Head 0.8 Forks 0.9 Chain stays 0.5 Seat stays 0.5 Steerer 2.5/1.65
Chas. 12 Gitanes Colerich
Oakland, CA USA