Straight advice, specialists you understand and...

Heavy Duty Coil Springs •

Leaf Springs •

Torsion Bars •

SPRINGS

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Springs - The Facts

The primary function of springs, whether they be Leaf,

Coil or Torsion Bars, is to absorb the shocks that are

created when driving across irregular road surfaces

and to maintain the tyres’ contact with the road.

The spring rate, or stiffness, must be matched to the

weight of the vehicle resting on it and the weight of

the other suspension components and the wheel.

Spring rate also controls roll stiffness, or body roll.

By reducing the amount of body roll, we reduce the

amount of wheel camber change. Large camber

change can drastically reduce the tyre’s contact

with the road surface, severely limiting the handling

potential during cornering.

The handling of most vehicles is substantially improved

by increasing the original spring rate to an optimum

rate which maximises tyre adhesion and reduces

body roll for better handling. Increasing the spring rate

beyond the optimum rate detracts from the handling

potential as the tyres begin to skip over bumps,

reducing grip and safety.

Coil Springs

Coil springs are the foundations of the modern

suspension system with most car manufacturers

preferring Coil Springs due to their advantages of

weight, tenability, space and ease of manufacture.

Pedders research, design and manufacture their own

range of Coil Springs from their own World-Class

Manufacturing plant in Victoria, Australia to ISO 9001

standards.

Coil Spring Design and manufacturing is a craft which

requires strict adherence to a demanding series of

procedures, all of which are critical to the performance

of the final product. Pedders undertakes the following

key steps in relation to its Coil Spring Manufacturing

Process:

• Hot Coiling

• Oil Quenching

• Furnace Tempering

• Shot Peening

• Scragging

• Loaded Height and Rate Testing

• Powder Coating and Packaging

Straight advice, specialists you understand and...

Pedders produces its coil springs to the highest possible

standards following ISO 9001 requirements.

Pedders offer the highest possible quality coil springs due

mainly to the following quality manufacturing elements;

Shot Peening

Shot Peening, using a full hardened steel shot, is the process

used to relieve stresses on the wire that are wound into the

spring during coiling. Shot peening provides extra life to the

spring which improves performance, durability and longevity.

Scragging

Scragging is the process of compressing the spring beyond its

normal working limit which effectively pre-sets the spring and

determines its finished height. Pedders scrag to 100% or “coil

bound” to improve the long term durability and performance

of the spring.

Load Testing

To ensure the most accurate finished product for the desired application,

Pedders Suspension load tests 100% of its coil springs to the vehicle’s

installed height specification. This system involves loading a spring with

a pre-determined, application specific load and specifying the height that

the spring must come to.

This is a far more accurate and complex system than simply a measure

of ‘free’ or ‘unloaded’ height. Pedders define a height tolerance of +/-

2mm for its range of SportsRyder & TrakRyder Springs and +/- 5mm for

its range of Touring Springs. This height tolerance for Pedders Touring

Springs is consistent with that of original equipment springs. Pedders

also load test 100% of its springs rather then simply batch testing.

www.pedders.com.au

WHAT IS ISO 9001?

The Pedders Suspension Coil Spring Manufacturing

Plant holds the World Recognised Manufacturing

Quality Standard ISO 9001.

The goal for Quality System Requirements ISO

9001 is the development of fundamental quality

systems that provide for continuous improvement,

emphasising defect prevention and the reduction of

variation and waste in the supply chain.

What this means for the retail and trade customers

of Pedders Suspension is that they can be assured

that they are using a product that is of a significant

quality standard.

The Pedders Suspension Coil Spring Manufacturing

Plant also holds ISO14001 Environmental

Certification, an international standard which aims

to support environmental protection and prevention

of pollution in balance with socio-economic needs.

Pedders Coil Spring RangePedders offers to its trade and retail customers, four

different branded coil spring ranges.

PedderS HeAvy duTy COIL SPrIngS

Pedders Heavy Duty Coil Springs are Pedders

standard and raised height replacement coil springs

for passenger and light commercial vehicles.

Pedders Heavy Duty Coil Springs are built to ISO

9001 standards and have unrivalled levels of

comfort, handling and load carrying ability.

Pedders SportsRyder Coil Springs are Pedders

Premium range of lowered Coil Springs for sports

and performance applications. Built to ISO 9001

standards with tolerance of only +/-2mm at load

height Pedders SportsRyder Coil Springs are

simply unrivalled in terms of handling, vehicle

appearance and performance.

SPRINGS

Straight advice, specialists you understand and...

Pedders Trak Ryder Coil Springs are the pinnacle of Four Wheel Drive Coil Springs

available in the marketplace. Once again TrakRyder Coil Springs are built to ISO 9001

standards offering the motorist unparalleled levels of stability and performance over

the roughest terrain or in the car park. Common applications offer several height

options for customers to choose from.

Torsion Bars, most commonly used

in recreational four-wheel drive applications

are simply a straight coil spring.

All torsion bars may look much the same but because they peform exactly the same function as coil and

leaf springs they must also be rated to match the total suspension system and weight of the vehicle. Like

Pedders Coil Springs, Pedders TrakRyder Torsion Bars are made from the highest quality alloy spring steel

according to strict production procedure and all fully heat treated and tempered for durability, hardness

and consistency. TrakRyder torsion bars are made to a larger diameter than most original bars, providing

a firmer rate for greater control and improved load carrying ability.

Pedders Trak Ryder torsion bars are heavy duty replacement units that provide a permanent upgrade for

the front suspension. Whether your vehicle is in standard form or has been fitted with a bull bar, winch,

dual battery system or any other heavy accessory, Trak Ryder torsion bars provide extra control, stability

and traction for enhanced performance.

Pedders Touring Springs, Pedders newest addition to its coil spring range, are built

to industry standards (thus less than Pedders premium Sports Ryder range) and

priced for the performance motorist on a budget. Still built to ISO 9001 standards

Pedders Touring Springs are simply the best quality budget coil springs available

in the marketplace – for the motorist more interested in vehicle appearance than

performance handling.

TOURING SPRINGS

SPRINGS

ToRSIoN BaRS

www.pedders.com.au

LEAF SPRINGS

For heavy duty load carrying and towing,

leaf springs remain the best performing suspension

design, but can become harsh, noisier and less effective

in dampening bumps and vibrations. They are also prone

to sagging and should be re-set or replaced when a change in ride

height or ride quality is observed.

Pedders offer full replacement leaf spring packs for car, light commercial and

four wheel drive applications that feature metal eye sleeves to minimise binding

and noise and are constructed from only the highest grade steels for absolute durability

and performance.

As an alternative to total replacement of leaf spring packs, Pedders offers a leaf spring resetting service

that involves inserting a new and higher rated leaf into the spring pack which is then re-set to the desired

ride height.

Pedders Suspension provides a comprehensive two-year, 40,000km nation wide warranty on Pedders brand-name products designed for road use, including shock absorbers, struts, springs and steering gears.#

#Some exceptions apply. Please contact your local store for further information.

WARRANTY