In article , Ed Huntress says...

Actually, a lot of custom bicycles are made with thin-wall 4130 today. If
you really want to see thin-wall tubing on a bicycle, saw through the frame
of an old, high-quality bike made with double-butted Reynolds 531 or
Columbus tubing. They're very darned thin.

Schwinn Paramount track bike - those things were scary to
ride, they were so light.

Jim

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