Originally Posted by
atnyc
Yeah, but there’s a down side (EVERYTHING has down sides!). Oval is not as strong as round shape for the same size. So they had to put more material to achieve the same strength.
Is that really the case? A seatpost only needs to be strong in the front-back direction. Indeed Thompson seatposts made use of this principle and made the internal thickness thicker in the front and back sides and thinner on the left and right. An oval seatpost is actually stronger than a round seatpost in the front-back direction.
Now if you were arguing that the Giant D-Fuse seatpost is weaker then I would agree with you. Their D shape definitely weakens the backside of the post.