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F-O-A.com Tech Tools - Spring Rate Calculator.

F-O-A Suspension Calculator How To - FOA Coil Over Shocks will typically use a Dual Rate Spring setup. We use a Main Spring and a Tender Spring.

Below is the information needed to properly calculate Spring Rates.

________ inches 1. Wheel Travel
________ pounds 2. Sprung weight of each applicable vehicle corner
________ inches 3. Pivot to lower shock mount distance (D1, D3, or D5)
________ inches 4. Pivot to end of suspension arm or tire centerline (D2, D4, or D6)
________ percent 5. Desired droop travel
________ degrees 6. Shock angle from vertical (in degrees)

Enter the above info into the F-O-A Suspension Calculator to get your recommended spring rates.