Spring Rate Calculator for Independent Suspension

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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

    Spring Rate

    		Measure the length of the lower control arm (dimension a).
    Measure the length between the lower coil-over mount and the lower control arm inner pivot point (dimension b).
    (b/a) 2=The motion ratio percentage at the ball joint.
    Divide the Motion ratio percentage into the desired ball joint rate to find the correct spring rate.

    Length of the lower control arm (a).

    Distance between the lower coil-over mount and the lower control arm inner pivot point (b).

    Desired ball joint rate.

    		 =

    Motion Ratio percentage at the ball joint

    Final Spring Rate
     

     

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    Last modified: June 21, 2011

     

     

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