SMS aka Steven M. Scharf wrote:
Tom Sherman wrote:
SMS aka Steven M. Scharf wrote:
[...]
Carbon frames that large tend to have problems of too much flex,
which is what the reviews of the 64cm Madone found. Colnago seems to
have solved this problem in their carbon fiber frames and they go up
to 65 cm.

The larger CFRP frames being too flexible is just poor engineering,
and has nothing to do with the inherent properties of CFRP.

To reduce the flex in the larger frames requires some engineering
enhancements because of the the inherent properties of carbon fiber.

Specifically what properties? Elastic modulus - all solids have one,
just differing in magnitude. Steel, aluminium alloy and
titanium/titanium alloy frames also need to be designed differently in
larger sizes to keep them from being more flexible than smaller sizes.

Apparently Trek just made the frame larger, without understanding that
this wouldn't work.

Colnago describes what they did at
"http://www.colnago.com/en/catalogo2008/extremepower.php".

"The Extreme-Power was born to meet the demands of sprinters Alessandro
Petacchi and Erik Zabel of Team Milram and three time World Champion
Oscar Freire of Team Rabobank who all have a power output of 180 kg for
each pedal stroke."

WTF? When did the kilogram (kg) become a unit of power instead of mass?

Quick, notify the General Conference on Weights and Measures of this change!

Do people actually get paid to write this stuff?

--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful