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Columbus probably buy tubes and shape them (like Reynolds). Maybe roll and shape. Maybe they make metal, but I doubt it.
miro_o-
Maybe they make metal, but I doubt it.
Only stars can make metal. Columbus makes tubes from steel supplied by a mill, not sure what form it's delivered in but they roll and weld it so it's either billet or strip
gbj_tester
Columbus do though and they're owned by the same people that own Cinelli.
Columbus is a manufacturer of steel tubing used in bicycle frames, located in Settala, in the Province of Milan. The company was founded in 1919 by A.L. Colombo and was taken over by Colombo's youngest son, Antonio, in 1977. It is now a division of Gruppo SPA, which also owns the bicycle manufacturer Cinelli.