[QUOTE=Big Block;17137538]the topic is addressed in this article
The Four and a Half Rules of Road Saddles
with a Brooks saddle, the normal rule is varied by
I have seen the article and the approach is what I have been following. On top of that guidance, other sites seem to advocate, making sure the "effective seating surface" is significantly wider than the sit bones. For example, one of the links I posted earlier says
"There needs to be some room to deform so I think you need to deduct at least 2cm from (the effective seating surface), 1 cm from the left and 1 cm from the right where your sit bones can come so that deformation and a comfortable riding position is possible."
The so called effective surface of a Pro is 130, the Swift is 120, and I am 110. I fit within the surface of both but barely on the Swift.
As Velocivixen points out, Wallingford and others have very generous exchange so it's hard to go wrong. At the moment, my heart wants the very pretty Swift (also I like variety) my head says go with what I know works, which would be Pro.