The double top tube isn't really necessary. I once made a standard
tube bike with a very light top tube as an experiment. I'm 6'3" and
weighed at the time 210 and I could notice no difference from my other
bikes with the same geometry and heavier top tubes. It's loaded in
compression and doesn't need to be real heavy. It just locates the
head and seat tubes the correct distance from each other.
Phil Brown

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