I’ve had good experience with UDC Germany so far, but that is just ridiculous. It looks like the robot welding the seatposts was setup wrong, and absolutely missed the bevel it was supposed to weld in. Clear quality control error that is not acceptable, and they should take care of.
EDIT: I have the seatpost pictured on top on my oracle, and it well… looks like in the top picture, so they did get it right in the past
I guess that confirms it’s a manufacturing defect. Thanks for the info.
I had ordered 2, and both showed up with the same defect. I reached out to UDC with photos and explanations. Since I was asked to pay to ship 'em back, I assume they consider the defect normal and these exact seat posts (or similar) will be shipped out to other customers.
I have to agree. I have three of those seatposts sitting around and none of them neck down like that. Mine are all the older model without the gusset-type thing at the top, but that shouldn’t change anything. The UDC web site has an unboxing video for the new version of the post, and it doesn’t neck down much.
So yeah, defective, and they should really take it back at no charge and quit selling that batch.
It is kind of hard to claim the part is structurally deficient just based on the external appearance. The strength at the smallest tube section is based on the actual diameter and tube wall thickness at that location. If the tube wall thickness is thicker at that point then is could be just as strong as a larger diameter tube with a thinner wall thickness.
It does look like most seat tube failures occur on the flat part that attached to the seat. I guess the only real way to say if it is a problem it to do some structural testing or just put it to use and see what happens.