i'm in need of a saddle and went about measuring my butt. came in at 115mm and what i've read is that i should add 20 mm and buy a seat, i mean saddle that size, that is 135 mm. turns out my current saddle is 135mm. probably a coincidence since i just put my butt on it many years ago and had no problems with it.

i've found a few 135mm saddles but was looking at specialized saddles and according to their measurement guide they say a 143 mm saddle is for me. i'd like to try not buy something that is totally incorrect only to shell out more for a better fitting saddle. does anyone know why there is such a difference in their sizing guide compared to everywhere else i've read? maybe 8mm is not all that much?