Quote:
Originally Posted by downtube42
Historically, low quality steel needed additional strength, particularly on taller frames. Over time, double top tubes became associated with strength. Even as the quality of steel made the design unnecessary, the image of strength persisted. Eventually it became retro cool, at least to some beholders.
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Better quality and stronger steel alloys doesn't always mean that double top tubes aren't still advantage. Many large frames are prone to shimmy, and a tendency to shimmy can be improved by increasing frame stiffness. But using a stronger steel to make a tube doesn't change its stiffness. Double top tubes does increase frame stiffness, and therefore can decrease the tendency to shimmy.