Spring Rate Calculations

When calculating your dual spring rates we request you complete the following steps with your existing setup and supply the information gathered in this process:-

NB The Driver and Co-driver should be in the vehicle when taking these measurements and the vehicle should be as close to "ready to race" condition as possible.

Step 1 - Fill in your Name, Phone and Email address in the boxes below.

Step 2 - Record the Shock Absorber Type and Shock Absorber Travel in the boxes provided.

Step 3 - Adjust the spring pre-load rings until your car sits at the ride height you want. This step is very important, even if the springs are loose when the suspension is fully extended.

Step 4 - Make sure the crossover ring (if you have one) is not pressing against the spring divider (the plastic part between the springs). This can confuse how much preload is required to reach the correct ride height.

Step 5 - Measure how long each spring is when your car is at the ride height you want - (Called Nominal length). Write these down.

Step 6 - Lift your car until the wheels are off the ground and the suspension is fully extended. Measure the length of each spring again while preloaded and write these down too. If there's a gap between the top of the spring and the preload ring, divide it by two and add half to the lower springs and half to the upper ones. This is the Installed Length.

Step 7 - Remove the springs from the shocks and write down the spring rate and how long they are this is the Free Length.

Step 8 - Spring Envelope: This is the longest possible spring that could fit. Wind the preload ring (top spring platform) all the way off and measure from the bottom side of the preload ring to the top of the lower spring platform. Record this measurement.

Step 9 - Thread Envelope: Measure the total length of the thread on the shock absorber.

Step 10 - Fill in all the boxes below.

Step 11 - Hit Send button.

Customer Name

Name:

Customer Phone

Phone:

Email:

	O/S	N/S	O/S	N/S
	Front		Rear
Shock Absorber Type	Front Shock Absorber Type Front Shock Absorber Type is required		Rear Shock Absorber Type Rear Shock Absorber Type is required
Shock Absorber Travel	Front Shock Absorber Travel Front Shock Absorber Travel is required		Rear Shock Absorber Travel Rear Shock Absorber Travel is required
Spring Rate	Front Spring Rate Upper Upper: lb/in Front Spring Rate Upper is required Front Spring Rate Lower Lower: lb/in Front Spring Rate Lower is required		Rear Spring Rate Upper Upper: lb/in Rear Spring Rate Upper is required Rear Spring Rate Lower Lower: lb/in Rear Spring Rate Lower is required
Free Length	Front OS Free Length Upper Upper: mm Front OS Free Length Upper is required Front OS Free Length Lower Lower: mm Front OS Free Length Lower is required	Front NS Free Length Upper Upper: mm Front NS Free Length Upper is required Front NS Free Length Lower Lower: mm Front NS Free Length Lower is required	Rear OS Free Length Upper Upper: mm Rear OS Free Length Upper is required Rear OS Free Length Lower Lower: mm Rear OS Free Length Lower is required	Rear NS Free Length Upper Upper: mm Rear NS Free Length Upper is required Rear NS Free Length Lower Lower: mm Rear NS Free Length Lower is required
Installed Length	Front OS Installed Length Upper Upper: mm Front OS Installed Length Lower Lower: mm	Front NS Installed Length Upper Upper: mm Front NS Installed Length Lower Lower: mm	Rear OS Installed Length Upper Upper: mm Rear OS Installed Length Lower Lower: mm	Rear NS Installed Length Upper Upper: mm Rear NS Installed Length Lower Lower: mm
Nominal Length	Front OS Nominal Length Upper Upper: mm Front OS Nominal Length Lower Lower: mm	Front NS Nominal Length Upper Upper: mm Front NS Nominal Length Lower Lower: mm	Rear OS Nominal Length Upper Upper: mm Rear OS Nominal Length Lower Lower: mm	Rear NS Nominal Length Upper Upper: mm Rear NS Nominal Length Lower Lower: mm
Thread Envelope	Front Thread Envelope mm Front Thread Envelope is required		Rear Thread Envelope mm Rear Thread Envelope is required
Spring Envelope	Front Spring Envelope mm Front Spring Envelope is required		Rear Spring Envelope mm Rear Spring Envelope is required
Notes

We have the facility to measure spring rates if you cannot identify your existing spring rates.

When finished you should have recorded the Free, Installed and Nominal length of each individual spring together with the amount of positive or negative preload and the existing rate. From this information we should be able to advise on optimum springs for your vehicle.

N.B. We only offer springs rate calculations as a service when customers have purchased shocks and springs from us.

Spring Rate Calculations

Contact Us

ISO 9001

Our Products

Hours of Business