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 to obtain the required ride height (even if the springs are loose at full extension, )This is VERY IMPORTANT.;

Step 4 - With the vehicle at ride height, ensure the crossover ring (if fitted) is not positioned against the spring divider **

Step 5 - Measure the overall lengths of each individual spring at ride height (we call this Nominal length). Record this information in the Nominal Length boxes.

Step 6 - Jack vehicle up so wheels are off the ground and suspension is at full droop.
              Measure each spring length and record these measurements in the Installed Length boxes.
              If there is a gap between the top the spring and the spring preload ring at this point,
              divide the gap by two and add half the gap to the lower springs and half the gap to the upper springs.

Step 7 - Remove springs from shock. Measure and record the existing rate and length record this in the Free Length boxes.

Step 8 - Record the maximum possible spring length that can be fitted to the shock in the Spring Envelope boxes

Step 9 - Record the thread length of the shock absorber in the Thread Envelope boxes

Step 10 - Record Spring Rates in the Spring Rate boxes

Step 11 - Hit Send button

. **This can confuse how much preload is required to achieve correct ride height.

Customer Name
Name:
Customer Phone
Phone:
Email:
  Front Rear
Shock Absorber Type
Front Shock Absorber Type
Rear Shock Absorber Type
Shock Absorber Travel
Front Shock Absorber Travel
Rear Shock Absorber Travel
Spring Rate
Front Spring Rate Upper
Upper: lb/in
Front Spring Rate Lower
Lower: lb/in
Rear Spring Rate Upper
Upper: lb/in
Rear Spring Rate Lower
Lower: lb/in
  O/S N/S O/S N/S
Free Length
Front OS Free Length Upper
Upper: mm
Front OS Free Length Lower
Lower: mm
Front NS Free Length Upper
Upper: mm
Front NS Free Length Lower
Lower: mm
Rear OS Free Length Upper
Upper: mm
Rear OS Free Length Lower
Lower: mm
Rear NS Free Length Upper
Upper: mm
Rear NS Free Length Lower
Lower: mm
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
Rear Thread Envelope
mm
Spring Envelope
Front Spring Envelope
mm
Rear Spring Envelope
mm
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.

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