Thinner or thicker carbon seatpost wall for comfort?

[cyan]

Just curious, all else being equal (diameter, length, carbon tensile strength, exposed length, tire pressure), how does the thickness of a carbon seatpost wall affect comfort?

[fa63]

For the same diameter, thicker sidewall means a greater moment of inertia; hence more resistance to bending / torsion. Not sure if one can feel the difference in practice however, since there is more to seatpost comfort than just wall thickness.

The most comfortable seatpost I have, a Syntace P6 Hiflex, has substantial wall thickness perpendicular to the pedaling axis, but not so much in the opposite direction, presumably to promote bending. Seems to work quite well.

[robt57]

Better riding posts are thinner walls sides, thicker front/back.

Ones I have that fit this type of construction are Thompsons, an alloy WCS Ritchey, and a Syntace P6.

One bike I shimmed a 27.2 to a Cannondale 25.4, the Ritchey and P6 seem to ride nicest.

[Black Dog]

Google the velonews article comparing the compliance of various seat posts. Very informative.