Sitz Bones "parts"

[Flur]

It seems that if your sit bones are 140mm apart you should be fine on a 155. Did you try those already and they didn't work for you? (I couldn't tell from your previous post if you'd tried them or if you had them on order). I don't know why a store would push a 143 for you; that's clearly too small.

Also, when you ride are you in a more upright position, or are you more folded over? I ride more folded over, especially in the drops (my seat is about 3 inches higher than my bars), and I find that I do feel more pressure on the inside of my sit bones, but I know my saddle is wide enough b/c both sit bones are dead on it with space all the way around - I can feel them pretty well and I've checked, numerous times. I had trouble at first and thought that my saddle was too narrow, but I stuck with it and let my pelvic muscles strengthen and now I'm pain free.