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King Springs is Australia’s leading specialists manufacturer if aftermarket coil springs for worldwide automotive applications. They have internal capabilities to design, develop, and manufacture springs all from the one site.

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King Springs leads the way in design and manufacture of advanced progressive springs with both variable pitch and tapered wire forms.

King Springs service all sectors of the automotive market including passenger, commercial and Four Wheel Drive vehicles and various motorsport categories including circuit, rally, speedway and off road racing.

King Springs was established in 1956 on Queensland’s Gold Coast.

Their complex today comprises of three adjoining factories spanning 8000 sqm


King Springs are manufactured using only the best X5K Steel available.

They use computer controlled coiling machines, electronic furnaces, automatic bar peeling process and cambering machines which have been designed and custom built by King Springs to ensure that all areas of the manufacturing processes are of the highest standard.

The high stress material that is only supplied from One Steel is shipped to the plant in an annealed state then bar peeled and polished to the exact size to remove all surface defects, then cut to length.

The material is then heated in electric furnaces to 1000 degrees celcius, formed on computer controlled machines, then hardened by quenching in oil to achieve a hardness of 62 HRC. At this stage the springs are end ground if required.

The next process is shot peening of all surface areas to increase durability.

Every spring is coil scragged, tested, and a full and final inspection is carried out.

All springs are then powder coated for the most durable finish and also to offer maximum presentation.

The springs are then labelled by inkjet and packed up as pairs ready for shipping.

King Springs carry large stocks of most springs for immediate supply.

All King Springs are manufactured under a quality control system that is xompliant with ISO-9001:2008


All King’s motorsport springs are made to order and custom designed for specific applications.

King Springs are found on most leading cars in every facet of motorsport including race, rally, off road and 4x4 racing.

At the forefront of their motorsport involvement are the Tapered Wire Progressive Rate Springs which have gained a worldwide reputation.

King Springs look at motorsport as being the ultimate testing ground for their products.

The information and experience gained from motorsport involvement only serves to enhance their abilities to be able to design and manufacture all of their products to the highest of standards.

Here are just a few of the current crop of V8 Supercar Teams that are using King Springs

Ford Performance Racing

Bottle-O Racing

Nissan Motorsport

Nissan Motorsport

Dick Johnson Racing

Progressive Rate Springs Information

There is no disputing the advantage of increasing the spring rate in a vehicle to improve vehicle stability and load carrying capacity, however, in many vehicles we are often confronted with three major considerations:

  • Ride Comfort
  • Shock Absorber Control
  • Spring Entrapment

RIDE COMFORT is always a consideration. The spring rate must increase enough to give improvement without causing undue harshness.

SHOCK ABSORBER CONTROL - The shock absorber obviously plays a vital role in controlling a vehicle's stability. Excessive spring rate can often find shock absorbers struggling to control the vehicle (lack of rebound control).

SPRING ENTRAPMENT - When an increase in spring rate and decrease in vehicle ride height is required, spring entrapment can become a problem. Previously, the only solution being a compromise of minimal increase in spring rate and/or minimal decrease in vehicle ride height giving unsatisfactory results (suspension bottoming or not low enough).


Progressive rate springs are the ultimate in spring design. The principle is simple. The spring rate increases when you need it (cornering, load carrying etc.) and decreases it when you don't. The science being over what suspension travel and to what degree the spring rate will increase. This varies greatly between vehicles. Referring to the above 3 conditions with Kings Tapered Wire / Performance Progressive Rate Springs a substantial spring rate increase is achieved with minimal loss of ride comfort as the spring rate increases and decreases where necessary. As the spring de-rates (the spring rate decreases) the shock absorber no longer struggles for rebound control and gives improved vehicle stability.

With Kings Performance Tapered Wire / Progressive Rate Coil Springs, spring entrapment problems are now often solved with substantial spring rate increases and ride height decreases available.


"The Intelligent Coil Spring"

Progressive Rate Design Principles

Remembering the principle, 'the less coils in a spring, the higher the spring rate' as the spring compresses under load the gathered coils come into contact and become inactive thus increasing the spring rate. The point at which each coil comes into contact and the rate of increase is the result of extensive research, development and testing on advanced testing equipment.


Kings Performance Tapered Wire / Progressive Rate Springs in most cases are designed around the De-rate principle, i.e.; the critical part of the suspension travel from ride height back to full suspension drop. The aim is to allow the spring rate to decrease smoothly back to original spring rate or as close as possible.


Original Spring Rate 120lb/" Heavy Duty Linear Spring Rate 160lb/" King Performance Progressive Spring Rate 130lb/" to 200lb/"


The above progressive rate spring would have similar or more improved ride quality than the heavy duty spring with a substantially higher spring rate being achieved at ride height.

Please Note: Tapered Wire / Progressive Rate Springs are not necessary for all vehicles and are only used in specific vehicles recommended by King Springs depending on suspension type and spring travel.

King's Tapered Wire / Progressive Rate Springs have the unique ability to allow many part numbers to cross reference not only between different vehicles but also front and rear. As the load varies in all cases, the spring rate adjusts accordingly

General Product Information

Height Options

Many springs are designed to cross reference and give various height options on some vehicles. This information is too diversified and complicated to be printed and is often conditional. Please consult technical staff if specialist height options are requested.


(measured centre hub to guard)

Car Coils

Please note: The following height classifications are a generalization only. Degree of lowering can vary between part numbers and vehicles. Spring design i.e. spring rate and vehicle height is relative to market demand. If exacting measurements are required for vehicle ride heights please contact King Springs.

Front Low: Lowers vehicle approximately 30mm below standard.

Front STD: Standard Height.

Front Raised: Raises vehicle approximately 20mm above standard (recommended for bull bar, country driving or whenever increased ground clearance is desired).

Rear Low: Lowers vehicle approximately 30mm below standard.

Rear STD +:Standard height to 20mm raised.

Rear Raised: Raises vehicle approximately 30-40mm above standard (recommended for excessive towing, load-carrying or LPG tank etc)

NOTE: Super Low coils are generally 40-50mm below standard.

4WD & Ford "F" Series Coils

Front and Rear STD: Raises vehicle approximately 10mm-20mm above standard.

Front and Rear STD: Raises vehicle approximately 10mm-20mm above standard.

Note: All heights mentioned are a generalisation only. Vehicle ride heights can vary, depending on:

Life and/or age of vehicle

Accessories fitted to the vehicle

Factory options (Country Pack, S Pack etc.)

When discussion vehicle ride heights, consider all of the above and advise customers accordingly.

LPG - For cars fitted with LPG tanks use part No. in Raised column to sit Std. Height.

Measuring Coil Springs

Listed below is relevant information required when identifying or measuring coil springs.

Free Length: The length of the coil at it's longest point out of the vehicle not under load. To measure, lay coil flat, butt one end to flat surface at right-angles with coil (see diagram A).

Open Strut Length/Trapped Length: The length of the coil when vehicle body is jacked up and all load is removed from spring (except pre-load).

Static Length: The length of the coil in the vehicle as it stands under normal load.

Inside Diameter:

(See diagram B) The width of the spring at it's widest point from inside edge to inside edge.

Note: Check both ends, as many coils can reduce at one end only or be conical in design.

Total Coils: The total number of complete turns e.g.. the coil drawn has 5.5 total coils.

Material Diameter: (Check with verniers) Note: Check end coils as diameter may decrease.

End Configuration: There are several types of end finishes:

i. Normal: (not ground, straight cut) Note: Measure end gap at tip to next coil (FWO-)or (FWC-)

ii. Ground: Ground flat (TWC-)

iii. Pigs Tail: End reduces greatly and will fit inside the coil below (PT-)

iv. Reduced: End coil will sit on top of coil below. (RED-)

Trouble Shooting (Coil and Leaf Springs)

Kings Performance Replacement Coil Springs in both STD and Raised Heights are often shorter than the springs they are replacing. This is because they don't compress as far under the initial pre-load or weight on the vehicle.

When sorting vehicle height problems, be sure that all wheel and tyre sizes and type pressures are compatible. Measure all four corners. Measure centre hub to guard, with vehicle on flat surface.

NOTE: Most vehicles transfer weight diagonally.

Many Part numbers listed in the catalogue have a driver's side and passenger side and are marked accordingly.

Wheel alignment is recommended after having front springs fitted on all vehicles. Some vehicles require wheel alignment on rear when rear springs are fitted. Refer wheel alignment specialist.

Allow 4WD Leaf Springs settling time of approximately 500klms then check and re-tighten all U-bolts and Shackles.


Custom-designed coil springs can be made to order in most cases within 2 weeks.

Why are Springs Replaced?

There are three major reasons springs are replaced:


There are 3 options when changing vehicle ride height:

A. To Lower the Vehicle

When lowering a vehicle it must be remembered that the vehicle will be closer to:

i. the road

ii. the tyres

iii. the suspension bump stops

For these reasons, performance replacement springs should be fitted.

B. To Maintain or Return Vehicle to Standard Height

Most common when original springs have sagged or previously fitted lowered springs are no longer required.

C. To Raise Vehicle

Common in Four Wheel Drive vehicles, heavily laden vehicles, LPG etc., towing or when ever increased ground clearance is required.


When improvement in handling is required, performance replacement springs will substantially reduce body roll and improve a vehicle's stability.

Performance lowered springs will also lower a vehicle's centre of gravity.


All vehicles are manufactured to a general acceptable standard and springs are no exception to this rule. With demands for comfort a growing priority, springs rates are kept as low as possible. For this reason, the original spring's ability to carry load and tow etc. is in most cases, poor.

Performance replacement springs will decrease the vehicle's ride height loss under load and improve vehicle stability when laden.

KING'S PERFORMANCE REPLACEMENT COIL SPRINGS will achieve improvement in any or all of the above 3 areas.

King Springs ProSport is a range of high quality coil over type springs specifically designed and manufactured for motorsport and performance street car application. The range includes both linear and tapered wire progressive rate springs as well as flat section tender springs and has been developed from many successful years of experience in the motor sport industry.


King Springs' commitment to motorsport initiated a new manufacturing process dedicated to volume production of the ProSport range to meet with stringent criteria required for motor sport applications.

ProSport features include:

  • Manufactured from new generation high stress X5K material to achieve the lightest designs with maximum travel.
  • All bars are peeled and polished to specific diameters for the best design and to remove all surface defects.
  • Heat treatment by controlled electric furnaces.
  • Shot peened for maximum durability.
  • All coils solid scragged and tested.
  • Tough powder coat finish.
  • All the above ensures that maximum travel, performance, quality and durability is maintained.

Research and Development

The very heart of King Springs business is the Research, Design and Development Department.

It is responsible for the ongoing development and advancement of products and encompasses all aspects of product evaluation.

King Springs rely heavily on input not only from staff members, but from the many specialist distributors throughout Australia that install and use the products daily. Qualified feedback is regarded as an extremely important part of the development program.

Exacting measurements are taken on and off the vehicle to thoroughly evaluate the design requirements.

Advanced equipment such as CAD systems and computer controlled testing machines are used to develop every part number. The spring is then extensively road tested to further fine tune and ensure optimum performance is gained.

Design Philosophy

At King Springs they are in the business of improving.

We believe the product, in most cases, is purchased to achieve improvements in 3 major areas:

  • Height
  • Handling
  • Heavy Loading

King Springs aim with all designs is that the product achieves the improvements it is purchased for. All springs are designed with Australian road conditions in mind.

All Kings Springs Heavy Duty Replacement Springs are designed to be up rated. The degree of up rating varies between vehicles but can generally be stated at 20-40%.