Maybe they 'should', I don't know, but, as designed, bike saddles, not even the ones pictured, allow for a wide 'fore-aft' movement. You are supposed to sit at the widest part of the saddle and stay there. Of course, you 'can' sit ahead of that spot, and behind, but you are not intended to stay there for any length of time. Set up correctly, the SMP saddles rise steeply from the wide platform rear. That's where you are meant to sit and the rise keeps you planted there. I like that 'in the pocket' feeling but it seems to chap the hide of most of you to be told 'sit here, we mean it'.