While attempting to determine required stiffness for our car's arbs, I used the formulas found in optimum g notebook. The part where it stops making sense to me is where the book sets forth a formula that is inversely proportional to the roll stiffness of the car due solely to springs, and then calls this value the "Desired Roll Rate". If you continue to follow their steps (which I tried my best to understand), you come up with a value of units (Nm/degree roll) which ends up being proportional to our input spring rate (since the rest of the variables are decided). This is referred to in the book as NEEDED anti roll bar rate. According to these formulas, if we have softer springs we will need ARBs that apply less Nm/degree roll to achieve the same roll per degree. That doesn't make sense to me. Any help appreciated, cheers!