Oh boy, I had trouble fitting this to my bike. It took me like 20minutes (it`s still faster than mounting fenders, but I expected a faster procedure). The problem was long bolts, that hold my saddle to a seatpost, the prefolded front end of ass-saver kept hitting the bolts when I tried to thread the ass-saver between the rails. Anyway, ass-saver mounted and holds there rock solid. After all, I`m glad that its like that, because I was afraid it will fall off during aggressive MTB ride through roots or other gnarly stuff.