Originally Posted by onespeedbiker

Reynolds butted CrMo (501) came along in the 80's. Prior to that CrMo was straight pipe (lugs not only join tubes but are exterior butting; Pretty much all the large manufactures started building Tig welded 501 frames as the process is much faster than lugs and some say create a stronger weld do to the short heating and cool off times, with the advantage of lighter tubing of the interior butting for medium level bicycles..