What does it mean when they say 8K or 500lb Spring Rate? When someone says “8K” they are shortening the metric measurement of the spring rate

in this case **8 kg/mm**. What this means is that if you apply 8 kilograms of weight to the top of the spring it will compress 1mm.

## What is a good spring rate?

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%).

## What is a high spring rate?

Spring Rate refers to the amount of weight it takes to compress a spring a certain distance. The higher the spring rate, **the stiffer the spring**.

## What is spring rate kg?

While companies using the Metric system will often list their spring rates with either k or kg, it really should be listed as kg/mm (**kilogram per millimeter**). So if a spring is listed at 5k it would mean it takes 5 kilograms of force to compress the spring 1 millimeter.

## Does spring rate affect ride height?

The spring rate and ride height **depends on the vehicle’s weight**. For example, if you have a lever ratio: 1.5, load at spring: 300kg and use 10k springs or 6k springs. The difference in ride height will be 30mm. Even if the lever ratio was 1.0, the difference will be 20mm.

## What makes a spring stiffer?

Total Coils

The amount of coils on a spring also determines the stiffness of a spring. **The less coils you have, the stiffer your spring will be**. In the case of a torsion spring, less coils give you more torque but less travel.

## What spring rate do I need MTB?

The standard formula is based on a 60:40, Rear to Front weight distribution. **Add 5% for a heavy rider (+200lbs.)** **Subtract 5% for a light rider (150lbs-)** **Add 2% for a recreational or beginner rider (more rearward bias)**

## How do you read a coil spring number?

Spring Length: Springs for coil shocks are rated using two numbers (you will see these stamped on the spring, e.g . 450 X 2.25). The first number is the weight (in pounds) needed to compress the spring by an inch (aka spring rate – see below) and the second is the travel length of the spring (in inches).

## How does spring rate affect ride?

Although **a higher spring rate reduces body roll**, it comes at the expense of a harsher ride. “Not only will a softer spring improve ride quality, it will also enable the tires to follow uneven road surfaces more precisely for improved grip.

## What is a low spring rate?

A lower rate spring that **lowers the ride height of the chassis with no bumpstop trimming**, making the bumpstop more active, would feel about as stiff as a higher rate lowering spring with the bumpstop trimmed, making the bumpstop less active.

## What spring rate do I need dirt bike?

Right out of the box your spring rates are usually set for someone of average size — this typically means **75 to 80 kilos or 165 to 176 pounds**. If you are lighter or heavier, that spring rate won’t perform as well for you. Next, determine your static sag and laden sag.

## What are spring rates measured in?

Spring rate is a value measured in either **pounds per inch (in the royal system) or newtons per millimeter (in the metric system)**. This value determines how much load you will be required to place on your spring in order to travel 1 inch of deflection.

## What is coilover spring rate?

So, what is spring rate? It’s **the amount of force that’s required to compress or extend a spring (coil in this case) by 1 inch**, and is measured in pounds per inch (lb/in).

## Do springs get stiffer over time?

Yup. **The springs will become harder over time due to the constant flexing**.

## Will new coil springs improve ride?

Over time coil springs weaken, so **if you replace only one spring, the left and right springs will respond differently to the road and the left and ride sides may have a different ride height**.

## What happens if you have too much preload?

Can You Have Too Much Preload? Springs work in both extension and compression so too much preload **makes the springs too soft on compression**. When this happens we have to compensate with shock valving and sometimes that can lead to harshness.

## Will a big spring have a big or small constant?

That is because the spring constant and the length of the spring are inversely proportional. That means that the original mass of (normalsize 30) gm will only yield a stretch of (normalsize 1) mm on the shorter spring. **The larger the spring constant, the smaller the extension that a given force creates**.

## How do you increase the stiffness of a spring?

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.

## Can you make a spring stronger by stretching it?

**Yes, a coil spring can be stretched and then shortened increasing it’s rate and maintaining stock ride height**, at least for a little while. In order to stretch the coil the steel would have to be stretch beyond it’s yield point.

## How do I choose a coil spring for my mountain bike?

How to Find the Right Coil Spring for your MTB Coil Shock

## What spring do I need for coil shock?

**0-2.25″ Stroke spring**. But you will notice, the spring itself is marked with 2.35. This is because 2.35 is the maximum useable stroke of the spring, and 2.0-2.25 is the ideal usable stroke of the spring.

## Will a rockshox spring fit a Fox shock?

**Fox springs will not fit on a Rockshox shock**, the ID is just too small and (if you can even get the spring on the shock) it will rub the shock body the entire time. Changing springs will not make a difference for you here (as they all have to have the same 1.5″ ID), and its not the ‘proper’ way to tackle the problem.

## How do you calculate coil over spring rate?

The steps below will help you to find an approximate spring rate for your coil-over application….

- Step 1 – Determine Sprung Weight. Corner Weight: (1/2 the front or rear weight)
- Step 2 – Calculating Motion Ratio.
- Step 3 – Coil Spring Angle.
- Step 4 – Select your shock stroke and spring length.
- Step 5 – Spring Rate.

## What do the numbers on car springs mean?

Only show this user. **The second number indicates the amount that the spring can compress, in inches, before the coils bind**. So, since on coil over shocks, you have a knob to preload the spring, you want the number to be larger than the actual stroke of the shock.

## How do you calculate dual spring rate?

The formula for a dual spring system is as follows: **top spring (TS) times bottom spring (BS) divided by the TS plus the BS**. ( TS x BS ) divided by ( TS + BS ) Her is how that goes: ( 250 x 250 ) divided by ( 250 + 250 ) next (62,500) divided by (500) equals 125 lb combined spring rate.

## Are stiffer springs better?

Ultimately, **softer springs will adapt to road irregularities far quicker than stiffer springs**, without causing a loss of contact with the road, and thus provide more mechanical grip.

## Should front springs be stiffer than rear?

**On very high-grip tracks, it’s usually beneficial to stiffen the front, even more than the rear**. It just makes the car easier to drive, and faster. Softer Front Springs: The car has more steering, especially in the middle part and the exit of the corner.