1964 Rudolf Dierl and Heinz Obermayer get to know and appreciate each other at work. At that time, they could not even remotely imagine what a revolution they would be responsible for in cycling.
The first cooperation of the two, came about through their common hobby, the creation and duplication of copper relief pictures. Later they were commissioned by a master car mechanic. He commissioned the two of them to produce complex aerodynamic components for sports cars, such as bumpers and spoilers made of glass fibre reinforced plastic. The high demand for these car parts led in 1984 to a new partnership with Mr. Hans Kufer and the foundation of KDO GmbH. This made it possible to produce the components in small series.
The three had their first contact with cycling and triathlon sports when a friend of them had the idea that KDO GmbH could produce covers for the rear wheels of bicycles. These covers should protect children's feet from getting into the spokes. No sooner said than done. Soon some triathletes use the rear wheel cover as an aerodynamic aid for their own rear wheels of their racing bikes. Dierl and Obermayer didn't know about this and learned by chance, during a visit to a triathlon event, about the misappropriated use.
In 1988, KDO GmbH was dissolved to face new challenges. These follow on the foot with an inquiry about the production of glass fibre sulky wheels for trotting. The further development is a safety improvement to the Makrolon cover used up to that point. Dierl and Obermayer produce about one hundred aluminium wheels for the horse racing industry on behalf of customers. However, despite their superiority, the wheels were not accepted by the more traditional trotting sport.
This failure prompted an acquaintance to stir up the two of them and make the claim that the production of sulky wheels was meaningless and that their expertise would certainly not be sufficient for the production of technically sophisticated road wheels. Neither Dierl nor Obermayer wanted to let this statement stand. Motivated by this statement, both of them have dealt extensively with the construction of time trial and triathlon wheels. They quickly found a suitable material for the production of wheels in insulating foam construction boards and aramid. The discs made from these materials were reinforced with carbon threads, so-called rovings, on both sides, thus forming a perfect spoke replacement. The result is the ULTEC disc (later DO2000), which was launched in 1990 and was used in racing for the first time shortly afterwards.
Although no marketing was done, the knowledge about the fast disc is spreading very fast. The production simply can no longer satisfy the huge demand. When an offer was received from Heidenreich to support the distribution, the two accepted and renamed the disc Heylight. In 1993 Dierl and Obermayer developed a spoked wheel made of carbon, which immediately received UCI certification when it was introduced in 1994. Only one year later the first wheels with aero rim profile followed.