[CR]OT Columbus tubing

Hi all,

I have a bike with columbus tubing which I do not know the name of. It is ridged on the outside (five ridges each a good cm wide, lenghtwise). What was this called and from when might it be?

Thanks, kim klakow Berlin, germany

-- Kim Klakow Diplom Grafik Designer Akimbo71@gmx.net +49172-1786481

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