Tange Infinity SL?
08-08-22, 12:37 PM
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the "-SL" is new to me, but (regular) Tange Infinity is not: this was the new generation of precision "micro-welded" seamed tubing that several JP tubing makers introduced.
They rolled flat sheets (of Cr-Mo in this case) into tubes and this permitted many more butting variations than simple single or double butted as in conventional cold-drawn seamless (such as 531, Columbus and previous Tange/Ishiwata/Miyata) so soon the market saw triple- and Quad-butted tubes.
The welding was automated by robots (probably a knock-on from JP auto-building technology) and the seam was so precise and heating so controlled they almost appear "seamless" after the seam finishing process.
Or so I have been told...
Edit: my guess is this might be a later iteration of Infinity tubing (later than the 1995 catalog you can view on Velobase) in which case the "SL" might stand for Super Light.
They rolled flat sheets (of Cr-Mo in this case) into tubes and this permitted many more butting variations than simple single or double butted as in conventional cold-drawn seamless (such as 531, Columbus and previous Tange/Ishiwata/Miyata) so soon the market saw triple- and Quad-butted tubes.
The welding was automated by robots (probably a knock-on from JP auto-building technology) and the seam was so precise and heating so controlled they almost appear "seamless" after the seam finishing process.
Or so I have been told...
Edit: my guess is this might be a later iteration of Infinity tubing (later than the 1995 catalog you can view on Velobase) in which case the "SL" might stand for Super Light.
Last edited by unworthy1; 08-08-22 at 12:56 PM.
