Being behind the sensitive, once the outputs exceeded 40 Km, this was turning systematically unpleasant and painful. I tested a lot of stool, gel or not, and I could not find "shoe to my foot." by taking the measures of my inter-Ischia space (13 cm) I finally understood why ... I needed a saddle at least 15 or 16 cm wide. Since I started my B-17 (17 cm wide) I immediately felt the difference (without treatment). I am on, no more pain and no sleep "parts". Only flat, the saddle is very slippery, you have to do it, i raised slightly the beak and it's going better. When it is formed in my behind, I think it will go even better but for that we must be patient. Also it is very beautiful and well made