What size shock spring do I need?

For example, if your shock stroke is 2″, your max spring free length is 130mm and your spring rate is 450lbs, you need a spring that is 2.25″ x 450Lbs x 125mm (if you don’t see a spring that has the exact stroke of your shock you can use a spring with a longer stroke, as long as the free length will fit).

What spring weight do I need?

Springs should typically be compressed 25-30% of the free length when supporting the weight of the vehicle. Drag race cars will normally use a lighter rate spring (about 30%) to promote weight transfer while a street car will use a firmer rate spring (about 25%).

How do you calculate fork springs?

Measure the distance from the bottom of the fork to the seal with the forks extended all the way until there is no pressure on the spring. Then, measure the distance from the bottom of the fork to the seal with the forks with a weight on top of the forks.

How do I know what size coil spring I need?

How to Measure a Compression Spring

1. Measure the spring wire diameter, preferably to 3 decimal places for accuracy using calipers.
2. Measure the outside diameter of the coils.
3. Measure the length in its free condition (uncompressed).
4. Count the number of coils.
5. Note the winding direction of the coils.

How do I choose the right spring?

When designing and manufacturing a spring, it’s important to consider both the inner and the outer diameter of the spring, its free length and its solid height. You also want to consider the spring materials, as that will influence the size of your spring as well.

How do you calculate coil springs?

To calculate the amount of spring rate you will need on order to meet your working loads, simply divide the load you will be applying on your spring by the distance you expect your spring to travel or compress under that load. The equivalent to that formula will be your compression spring rate as shown below.

How is Motorcycle spring rate measured?

“Spring rate” reflects the stiffness of the spring and is measured in kilograms per millimeter or pounds per inch. One of the ways to test spring rate is to first measure the spring’s “free length”-the uninstalled length-and then put weights onto it, measuring the resulting compression with the addition of each weight.

Is higher spring rate better?

See all 13 photos Your springs’ rate—the amount of weight required to compress themselves a single inch—should be settled upon before getting too far into suspension upgrades. Get it right and you’ve just improved handling and grip. The bigger the number, the stiffer the spring.

Is spring rate the same as stiffness?

Spring stiffness is based on spring rate. If you lower the amount of coils, you’ll increase the spring stiffness which is the spring’s rate. If you adjust the outer diameter or the wire diameter, you will affect spring’s force and stiffness as well.

Does spring rate affect ride height?

You should increase the spring rate from the standard rate. (If you increase the spring rate, the ride height will also increase, so please lower the lower seat.) When driving at the circuit, it is ok to lower the car until the tires nearly touch, but if you drive to the circuit, please abide by your local regulations.

How do you calculate spring suspension?

How To Calculate Spring Rates

1. L = Free Length of The Unloaded Spring (m)
2. G = Shear Modulus of Rigidity of Material.
3. d = Wire Diameter (m)
4. D = Mean Diameter (m)
5. N = Number of active coils (an active coil sweeps one full circle)

What is Motorcycle spring rate?

The spring rate is the amount of force required to compress the spring over a set distance. The most common value is ‘lbs per inch’ or ‘lb/in’. So for example, a 300lb/in spring will need 300lbs of force to move it 1 inch.

How is suspension weight calculated?

Sprung weight = Corner weight – Unsprung weight. It is the weight supported by the spring and is the only weight used in calculating spring rates.