Below is a link to a scan of Columbus tubing specs from Bobby Sapovits' website. Not sure what year but much of the stuff really didn't change much.
http://mywebpages.comcast.net/
Bobby also has some scanned specs for other steel tubesets also. See:
http://mywebpages.comcast.net/
Charlie Young
Honeybrook, PA
> I am hoping that someone on the list can help me. Earlier
> on this week I went and saw 2 steel bikes that were for
> sale. One was an Olmo and the other was a Gianni Motta. I
> would put the age of the bikes as mid to late 80's. Both
> had ribbed tubing but a deeper ridge than I have seen
> before. I must admit that I have a passion for the ribbed
> tubing. Regretably both bikes had been resprayed so no
> tubing sticker on them. The Motta was a frame and fork so
> had a look down the seat tube and saw no internal
> reinforcing. The seat tube diameter I thought was closer
> to 26.8 than 27.2. The Motta frame and fork appeared to be
> very heavy when lifted. Can anyone enlighten me on the
> ribbed tubing - what is the base tubing SLX,SL or Aelle.
> Can you use a thin walled tubing as in SL and put in the
> indentations or is it generally a thick walled tubing that
> is used. Does anyone have any catalogues from Columbus
> that details this type of tubing - all my catalogues only
> list the straight tubing.
> Thanks
> Phil Grizic
> Durban - South Africa