For me, saddle height is like this: Have you heard of the method where you sit on the seat and put your heel right over the axle of the pedal, then back pedal? If you have the height set right your leg will straighten, but your hips wont rock. Well, I do that, but then raise the saddle like another 1/4" till my hips just start to rock. For me, thats the right height. I like to spin a lot and probably average about 95 rpm. Its really a subjective thing, but this is what works for me.