Shock Absorber Valving Calculator

Shock absorbers control how a vehicle's suspension responds to bumps — and valving them correctly determines whether your ride feels composed or chaotic. Enter your vehicle weight, front weight distribution, front and rear spring rates, shock stroke length, shock body diameter, desired ride frequencies, damping ratio, and application type into the Shock Absorber Valving Calculator to get your target compression damping force. Secondary outputs include rebound damping force, recommended shim stack thickness, and required oil volume.

kg
%
N/mm
N/mm
mm
mm
Hz
Hz

Results

Compression Damping Force

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Rebound Damping Force

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Recommended Shim Stack

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Required Oil Volume

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Frequently Asked Questions

What is shock absorber valving and why does it matter?

Shock absorber valving refers to the internal valve system that controls oil flow and creates damping force. Proper valving ensures optimal suspension performance, vehicle control, and ride comfort by matching damping characteristics to your specific vehicle and driving needs.

How do I determine the correct spring rates for my vehicle?

Spring rates depend on your vehicle weight, weight distribution, and desired ride frequency. Use the calculator inputs to experiment with different rates. Generally, heavier vehicles need higher spring rates, and performance applications benefit from stiffer springs.

What is the difference between compression and rebound damping?

Compression damping controls how fast the shock compresses when hitting a bump, while rebound damping controls how fast it extends back out. Proper balance between both is crucial for stability and comfort.

How does ride frequency affect my suspension setup?

Ride frequency determines how quickly your suspension oscillates. Lower frequencies (0.8-1.2 Hz) provide comfort, while higher frequencies (1.4-2.0 Hz) offer better handling and reduced body roll for performance driving.

What damping ratio should I choose for my application?

Choose 0.5 for maximum comfort, 0.7 for balanced street driving, 0.9 for sporty handling, or 1.2 for racing applications. Higher ratios provide quicker settling but firmer ride quality.

Can I use this calculator for different shock absorber brands?

Yes, the fundamental physics calculations apply to all shock absorbers. However, specific shim stack recommendations may vary between manufacturers due to different valve designs and tolerances.

How often should I recalculate my shock settings?

Recalculate when you change vehicle weight, spring rates, or driving style. Also consider recalculating when switching between different applications like street driving and track use.

What tools do I need to adjust shock absorber valving?

Professional valving requires specialized tools, shims, and knowledge. While this calculator provides the target settings, actual valve modification should be done by experienced suspension technicians or sent to a professional rebuilder.