On Thu, May 6, 2010 at 1:46 AM, happyriding <happyrid...@yahoo.com> wrote:

> On May 5, 9:42 pm, PATRICK MOORE <bertin...@gmail.com> wrote:
> > I'm glad I got a 56 with the single tt. I can see any reason for two,
> > neither looks nor durability. Odd.
> >
>
> Maybe not on the 56, but as frames get larger they become more
> susceptible to shimmy.  The 60 and above could be shimmy machines in
> the right conditions.  And if you've ever experienced high speed
> shimmy, you will readily consider purchasing a triple top tube bike if
> it's offered.  Hey, a Triple-pillar for 2011?
>

There are lots of bikes over 60cm that don't shimmy.
If it's a problem, it can be fixed by making the top tube
and or down tube thicker or larger in diameter.
For years the Atlantis was sold as a stout touring bike,
and it never had two top tubes. At one point, they even made
it as big as 68cm!

Jay Hartman

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