How is suspension spring rate calculated?
How To Calculate Spring Rates
- L = Free Length of The Unloaded Spring (m)
- G = Shear Modulus of Rigidity of Material.
- d = Wire Diameter (m)
- D = Mean Diameter (m)
- N = Number of active coils (an active coil sweeps one full circle)
What is a good spring rate?
The softer rate will generate a smoother ride while the stiffer spring will result in a firmer ride. You need to consider these options when you are selecting the proper spring rate for your application. Springs should typically be compressed 25-30% of the free length when supporting the weight of the vehicle.
What shock spring do I need for my weight?
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).
How do you calculate natural frequency suspension?
f = 1/(2π)√(K/M)
- 0.5-1.0Hz Passenger cars, typical OEM.
- 1.0-1.5Hz Typical lowering springs.
- 1.5-2.0Hz Rally Cars.
- 1.5-2.5Hz Non-Aero racecars, moderate downforce Formula cars.
- 2.5-3.5Hz Moderate downforce racecars with up to 50% total weight in max downforce capability.
What is suspension spring rate?
In simple terms, a spring’s rate is the amount of weight required to compress itself a single inch. It’s a universal measurement, it applies to everything from lowering springs to valve springs, and it’ll look something like this: 500 lbs/in. The bigger the number, the stiffer the spring.
What is suspension motion ratio?
Motion ratio in suspension of a vehicle describes the amount of shock travel for a given amount of wheel travel. Mathematically it is the ratio of shock travel and wheel travel. The amount of force transmitted to the vehicle chassis reduces with increase in motion ratio.
Is higher spring rate better?
You might think the higher spring rate would react faster, but in reality, the lower spring rate will contact the ground first, and thus allows for more grip.
What is spring rate formula?
To calculate the compression spring rate of this spring, divide the load of 20 pounds by the distance traveled of 2”. The compression spring rate calculated will be of 10 pounds of force per inch. k = L ÷ T. k = 20 ÷ 2. k = 10 lbf/in.
How do I choose a spring for my rear shock?
Use A Spring Rate Calculator Simply input your riding body weight, your shocks stroke, your bike’s rear-wheel travel, and choose if you’d like a more plush ride with about 33% sag or a more supportive ride with about 28% sag.
What is spring rate in suspension?
How do you calculate motion ratio in suspension?
The equation is WR = SR(MR)2, WR is wheel rate in LBf/in, SR is the spring constant (also known as k) in LBf/in, and MR is motion ratio where MR is stated as shock position/wheel position. For reference, the front wheel rate of a F355 Challenge car is 1,078 LBf/in with a 2200 LBf/in spring!