Originally Posted by
FBinNY
The 30mm is probably OK since the frame maker determined that it would work for the tubing. Understand that the support length needed in the middle, is different that at the end. I'd prefer more engagement length because IME posts with short sleeves tend to creak due to flex, which more engagement would prevent. But that's not a question of safety or structure.
Yeah, I figured it wouldn't have been designed like that if it was gonna break. On reflection, it makes sense that 30mm would be OK if one of the concerns is the post camming out, obviously it needs to have the end clamped in order to do that.
I haven't noticed it creaking at all, so I think I've gotten lucky in that regard...