I am a friend of SQlab concept. However, I did get to feel how important it is to buy the right nut width. I have my seat bone distance measured 12.5 cm and was now in doubt I have to buy a 14cm or 13cm wide saddle. I chose 14cm wide. after about 1500km and repeatedly sores on your inner thighs I bought with now the saddle in 13cm width, and lo and behold after about 400km still no problems!