Columbus tubing

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My frame is a Batavus pro and believe they built in 531 or Columbus SL only. My sticker lacks the letters SL but does have Tubi Rinforzati Guarantiti and also Accaio Speciale as seen in the picture.....is my frame Columbus SL...it is smaller than 58cm....about 54cm...i would gratefulfor confirmation.

I assume you found this?

"Mystery solved - at least partially. Tretubi means "three tubes". Only the main triangle consists of Columbus SL or SP tubing. The stays and forks are some lesser material. They could be a lesser Columbus grade, like Aelle or Cromor, or they could be high tensile steel. Regardless, they are heavier than the forks and 555SL stays in your Competition.

The other factor is that your frame size. At about 58-60cm most Italian builders started switching from Columbus SL to the heavier Columbus SP tubing. Your frame is at the transisition point and since the decal does not indicate SL or SP, the main triangle may be either, depending on the builder's preference. It may even be a combination, such as SL with an SP downtube, which was a popular solution for some extra rigidity without adding too much weight."

"Tretubi actually means that only the three main tubes are made of the Columbus tubing indicated by the sticker. Your Basso's sounds like it is comparable to my 1978 SuperCourse - which was made with Reynolds 531 (as opposed to Columbus) in the three main tubes."

"Tretubi actually means that only the three main tubes are made of the Columbus tubing indicated by the sticker. Your Basso's sounds like it is comparable to my 1978 SuperCourse - which was made with Reynolds 531 (as opposed to Columbus) in the three main tubes.

Doesn't the "Tubi Speciali Rinforzati" indicate that the tubes are butted? If I'm not mistaken I think the main tubes on the Super Course were straight guage 531."

"Doesn't the "Tubi Speciali Rinforzati" indicate that the tubes are butted? If I'm not mistaken I think the main tubes on the Super Course were straight guage 531.

I think you're correct on the Italian, and I know you're correct about the Super Course being straight gauge."

http://www.bikeforums.net/archive/index.php/t-150526.html

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