|Components of an Alloy Wheel|
|Bolt (Pitch) Circle Diameter / Bolt Hole Pattern
indicates the diameter of two opposite bolts on the wheel hub of a car, and how many bolt holes the wheel needs to fit the hub.
For optimum flexibility, DEZENT uses reduction rings so that a wheel can have a number of centrebore diameters with only one centrebore hole (basic ring system)
is the distance from the mounting surface to the rim's true centreline. This measurement is very important as it determines the positioning of the wheel on the car.
is the inner distance between the two rim flanges.
The rim width also indicates the nominal width of the wheel.
When strong lateral forces are acting on the wheel (e.g. when driving around curves), the hump keeps the tyre from slipping around on the wheel, thereby preventing a sudden loss of tyre pressure. There are a large number of different hump designs.
Key wheel indicators:
7.5....Nominal width (rim width)
J.......Size of the rim flange
17.....Nominal diameter of the wheel
H2.... Double hump (individual hump design)
|Specials at DEZENT|
|Nano tec – easy 2 clean® Brilliant Silver
”Nano tec Brilliant Silver” is a finish manufactured using nanotechnology that is able to repel dust and dirt. Our Nano tec finish was specially developed by our experts at DEZENT Produktion together with the company FreiLacke located in Bräunlingen, Germany.
This special finish has a very low surface energy allowing it to repel water (creating a beading, or “lotus leaf” effect). This means that oily substances, dirt and brake dust no longer stick to the surface, making the wheel “easy2clean”. In addition, our Nano tec Brilliant Silver finish is scratch-resistant, extremely tough and heat-resistant – all properties that the world has come to expect from high-quality DEZENT alloy wheels.
DEZENT Leichtmetallräder is the first company world-wide to use nanotechnology in wheel finishes.
Nano tec – easy 2 clean is used on the DEZENT A.
A Wheel Dish with EH2+ Hump
The EH2+ hump is the latest development in hump design.
Together with runflat tyres, the EH2+ hump guarantees that the tyre will not slip off the wheel due to a sudden loss of tyre pressure. Of course, non-runflat tyres can also be used, but without these pluses.
The EH2+ hump is currently is use with our new wheels:
the DEZENT J and the DEZENT R.
|Developing Wheel Models|
The story of a wheel begins with a design idea. Design specification documentation is drawn up outlining the basic definition, appearance and the technical structure of the wheel (one-section, two-section or multi-section). This idea is then brought to life using special CAD software to create the first 3D model for testing.
The software allows the wheel to be turned three-dimensionally and for improvements to be made easily.
|Wheel tension testing|
Enormous pressure –exceeding by far any actual strain on the wheel in reality – is applied to the 3D wheel model in computer simulations, which calculates tension and warping. The computer also displays the resulting changes in the wheel using different colours. The areas subjected to the greatest amount of stress are shown in red, while stress-free areas are shown in green.
In this test the 3D wheel model is examined to see if any warping has occurred in the spoke flange. Here again, the critical areas show up in red, and the design modified and corrected.
Final Testing of the Wheel
The 3D wheel model is modified and optimised until the critical stress levels are eliminated. The wheel is designed to withstand enormous loads, guaranteeing safety for the driver and the highest-quality product for us.
Each and every wheel made by DEZENT undergoes TÜV testing as a matter of course, guaranteeing a high level of traffic safety for years. The most important TÜV tests are:
|Using Alloy Wheels in Winter|
|Caveat: No wheel is manufactured exclusively for use in winter. A wheel’s suitability for use in winter (resistance to salt and gravel) is determined by the quality and coating strength of the clear finish.
DEZENT uses an especially high-quality finish developed particularly to withstand rough winter conditions.
The objective was to strike an ideal compromise between the strength and elasticity of the finish. There are several non-standardised ways test these properties. The toughest test is certainly the Jaguar drop test. A M8 nut is dropped from a height of 4 m through a tube so that it hits the wheel, testing to make sure the finish does not chip.
Protection from salt:
All DEZENT wheels must pass the salt-spray test. In this test the finish on the wheel is scratched and sprayed with an acidic solution in a plastic container for about 300 hours. This test demonstrates very clearly how high the quality of the finish is, as the finish opens up, or “blossoms” where the clear or silver finish has any quality defects.
|Snow chains: |
Snow chains, mounted properly and at the right time, are not a problem for DEZENT wheels in principle.
Depending on the vehicle, DEZENT pays special attention to make sure that snow chain access is included in the TÜV certification.
|Cleaning, Care and Storage of Alloy Wheels|
Specially designed cleansers and cleaning cloths have been developed for alloy wheels.
At no time may aggressive chemicals, scouring agents or similar substances be used, as they may diminish the appearance of the wheel.
When storing the wheels, e.g. during the winter season, they should be cleaned first and kept in a dry place.
|Repair of light-alloy wheels |
Every type of interference with the rim material (heating, welding, adding of materials, or even engraving, etching and grinding) results in a change in material properties and invalidates the strength test report.
! ! ! The wheel owner thus loses all rights to liability and warranty claims ! ! !
Based on these facts and our responsibility to our customers, we most urgently advise against rim repair even though insurance companies have lately started to push for this type of repair work for cost reasons.
Unfortunately, repair of light-alloy wheels is still very common. This information explains why it would be better to steer clear of the repair of light-alloy wheels.
Should you need any further information, please don't hesitate to contact the experts at AEZ Light Alloy Wheels and TÜV SÜD Automotive.
AEZ, Mr. Ing. Pierre Czompo, Tel.: 0043-2256-801-513
TÜV SÜD Automotive, Mr. Jürgen Hübner, 0049-89-32950-693
AEZ Technical Department, 2008