I initially tried the Ruby in a 143 because it's a women's saddle and the LBS pushed me in that direction. The chafing and saddle sores about killed me. Supposedly my sitbone measurement put me on a 143. I decided to try a Toupe 130 because either a Ruby 130 wasn't in stock or it's not manufactured in that width - i don't remember. Anyhow, I like the Toupe better because it is a very flat saddle. 130 is as narrow as i can go, but 143 was certainly too wide despite their measurements. I think the measurements are subjective, especially when you spend a lot of time in the drops. I don't get the chafing with the toupe that I was getting with the Ruby. I put a Specialized Phenom on my CX bike. It has a slightly longer nose and is slightly more cushioned, but otherwise very similar. It is my favorite saddle; even better than the Toupe. Hope that helps.