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Spring Rate Calculator for
Independent Suspension
When selecting the correct spring for an
independent suspension, use this simple formula for motion ratio
at the ball joint:(b/a) 2
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| Measure the length of the lower control
arm (dimension a).
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| Measure the length between the lower coil-over
mount and the lower control arm inner pivot point (dimension
b).
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| (b/a) 2=The
motion ratio percentage at the ball joint.
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| Divide the Motion ratio percentage into
the desired ball joint rate to find the correct spring rate.
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