Originally Posted by
USAZorro
The seatpost is way thinker, and much less flexible than frame tubing. Same thing with a stem. Couple this with the extra strength of smaller triangles as others have mentioned, and all else being equal - you have a stiffer frame.
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
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