Originally Posted by
bored117
Thicker material compensates for that easily. I do think the real reason being they rarely need that length (folding bikes are about the only ones that needs long post and they have their own manufacturing for it).
I would worry more about the stress it can put on seat post clamp area of frame which actually bears brunt of torque.
no. Thicker walls do not help strength as much as larger diameter. Thicker walls would just add a lot of unnecessary weight.
As long as the bottom of the seatpost extends past the top tube joint, the seatpost won't crack prematurely from the extension.
best example I can give you is trying to bend various diameters of copper piping and rods.