quality & technology

dotz in perfection

The highest quality standards in wheel design

The product strategy of DOTZ is to deliver wheels that adhere to the highest possible quality standards. We subject our wheels to a number of tests and processes to ensure that these high quality standards are met.

It starts by perfectly organising our wheel design development. All of our production partners (also subject to mandatory ISO 9001 certification) share our high quality standards as well. During production, we continuously test our wheels to make sure that they conform to size specifications and that the materials are homogenous. We also carry out a factory exit check to ensure that the wheels are of proper density and are free from visible defects. Before delivery all DOTZ alloy wheels undergo stress tests involving 200,000 load cycles performed by TUEV. An impact test is also carried out simulating a collision with a curb stone.

Only when our wheels pass all of these tests they are delivered to our customers all over the world from our distribution warehouse in Siegburg (Germany).

These tests, coupled with our untiring efforts to continually develop all of our designer wheels on the market, form the cornerstones of AEZ’s quality assurance policies. In so doing, we are able to meet the demands of our customers and make the highest engineering standards compatible with attractive wheel designs.

ISO Certificate 9001

ALCAR Wheels GmbH, who developed and distribute the wheel brand DOTZ, are certified for their quality management by the German technical certification institute TÜV. This certification is renewed on an annual basis and guarantees continuous improvements in the development of our wheel designs and in customer service.

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design   & construction

the wheel-development

The rim is created using computer-aided design (CAD) software while the finite element analysis (FEA) simulates deformations during operation. In this way, important details be determined realistically.

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production   & technologie

production of alloy rims

DOTZ light alloy rims are manufactured using the permanent mold casting method. Once the wheel is cast the mold is removed and each wheel reworked and finished hand-made.

One Piece Wheels

The casting of wheels is the process of getting molten aluminium inside a mold to form a wheel. This can be accomplished in many different ways, yet isn´t as simple as it sounds. But with attention to detail can yield great results. This is the most common type of aluminium wheels.


This is the process of pouring molten aluminium inside a molt to form a wheel. While some manufacturers simply use Earth´s gravity to pour the molten aluminium, others employ pressure systems to either inject or suck the molten aluminium into a cast. Once the wheel has been molded, it is then removed from the cast and finished.

Spun-Rim, Flow-Forming Or Rim Rolling Technology

This process begins with a low-pressure type of casting. A special machine then spins the initial casting, heats the outer portion and uses steel rollers pressed against the rim area to pull the rim to its determined width and shape. This process yields a rim area similar in strength to a forged wheel, yet not as costly. Some OEM high-performance or limited production vehicles utilize special wheels with this type of technology, resulting in a light, strong wheel at a reasonable cost.

Forged Wheels

Forging is the process of forcing a solid billet of aluminium between the forging dies under an extreme amount of pressure. This extracts unwanted elements, making the metal less porous and changes the metal´s grain flow into the shape of the wheel, making it stronger than cast or machined metal parts. It is also very light. However, the process and equipment comes at a high cost.