Originally Posted by somnatash

Ah the red line. That is 64,5 cm (I call it "from seatrail to center of bb"). Yes, I will swap the seatpost for a longer one. The regular seatpost is already 35mm so I will have to look for 40mm or more which are not that frequent. I spoke to Tom from Pacific Cycles about this issue of swapping the post. He warned me, that the tube might be bent then because of higher leverage, no guaranty any more then. (I don't have that anyway, have no bill) Then I spoke to Mark Sanders about this issue and he said with my weight I could relax and do it. The bike is free for 85kg and at that weight, he would not recommend to use a longer post.

Yes, folding size will be compromised but footprint here seems more crucial to me then folded height, so no matter. And perhaps I also try a shim or a slightly bigger in diameter post (which would have to be an unusual diameter of 27,3 -27,4mm then). My worries are solved for the moment as the post is actually not moving, it was the "connection between Seat stays and seat tube.