Again, both the shocks and the springs control ride quality and feel. They are a system, one does not work well without the other. I have modeled these systems and they all play a component. The degree of which depends on the circumstances and the components. Just as jjvw has stated he has experience with tuning his shocks to control roll, I have changed out springs and have had roll impacted. I am personally not dismissing jjvw’s statements, but he is now saying that springs don’t play a roll at all except for ride height and I cannot agree with that based on both physics and experience. My statement is that during a slow and steady curve, which one is going to be dominant. Given their experience I’ll even concur that in a lot of cases the springs aren’t dominant, but I know when I had my RE express springs on, I had a lot less roll than with dual rate.