It makes sense that it's a hard dimension to get good measurements for. Even with the play-dough method, i didn't get clean prints. I've been getting anywhere between 155 and 170. Split the difference...somewhere in the 163 range.

It makes sense that I should probably go for the slightly wider saddle. I know it's quite individual, but it makes sense. Muirenn, didn't you have a 143 Spec saddle at one point? What made you switch? (Or am I completely making things up?)