Originally Posted by
jgedwa
Good point. Seatposts are many, many times thicker than frame tubes, and so there is not an equal give and take between the flex of a large triangle traditional frame and the flex of a compact frame.
Now, stem flex might be a different matter given the torquing nature of the forces on the stem.
jim
And it is because this seat post is many times thicker that Cannondale said that a compact frame will not be lighter than a conventional frame. The very long, very thick seat post is also very heavy. And, as GV27 said, "the equilateral triangle is stronger" than a non-equilateral triangle, so a compact frame cannot be stronger than a conventional frame.