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A solid axle suspension is analyzed for roll angle by this method. It’s seen as the sprung weight being supported by the two springs. There’s no wheel rate calculation needed for a solid axle suspension. The car doesn’t know there’s an axle or wheels beneath the springs. All it knows is that it’s sitting on the top of two springs. What influences the roll angle is the spring base width, spring rates and spring split if they are different rates. The moment arm is the line between the center of gravity and the moment center.