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@gbj_tester
Also true, but this has always been at the cost of reducing stiffness.
Of course, there has also always been an equal amount of BS about how much frame stiffness you actually need. Even in super thin walled 753, the old fashioned 1⅛" OD down tube & seat tube with a 1" top tube yielded a frame stiff enough to have satisfactory handling in a road race geometry, although even the heavier 531 could be a bit marginal with touring loads and the correspondingly longer tubes. The problem is easily solved by adding ⅛" to all the main tube ODs, with scarcely any increase in the total amount of metal employed.