I'm a little confused. How do you know when you have your saddle adjusted correctly? I find when I'm about 10 miles into a ride I seem to be further and further back on my saddle. I ride with my hands very forward on my mtb bike and the saddle is all the way back.

I never was good at anatomy - the big bones in my butt are very near the back of the saddle. I'm 6 feet tall - my bike has an 18 inch frame. I feel very comfortable on the bike. I have not made any alterations to the original compenents.

Your thoughts?