Pro-Formance Shocks, Inc - Spring Rate Caculator for Indepndent Suspension

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

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
			=

PRO-formance Shocks, Inc.
1715 Lakes Parkway • Lawrenceville, GA 30043
Phone 770-995-6300 • Fax 770-513-4406
E-mail: proshock1@aol.com
Hours Monday- Friday 8:30 - 5:30 Eastern Time