Horex is a German motorcycle manufacturer. In 1920 Friedrich Kleemann (1868-1949), financial manager at the Rex Konservenglas Gesellschaft (preservative jar manufacturing company) in Bad Homburg (Germany) bought COLUMBUS MOTORENBAU AG, a small motor factory in Oberursel by Taunus, which was in the neighbourhood. The factory made the later Horex model and the name remained the same for almost 30 years. Fritz Kleemann, the son of Friedrich Kleemann, made the first cycles with a GNOM engine, delivered from the Columbus-Engine factory.

In 1923 Fritz Kleemann (1901-1975), founded HOREX-FAHRZEUGBAU AG. He derived the name from his town HOmburg and his father's preservative jar company REX. He was also a motorcycle racer and was riding his own Horex machine. He built the first "real" Horex, a 248cc, OHV, that he tested himself on race. So, Horex was built for motorcycle riders by motorcycle riders.

Horex built motorcycles with Columbus four-stroke engines from Oberursel. In 1925 Horex and Columbus merged. Horex developed a range of models with single-cylinder Columbus engines from 250 cc to 600 cc. In 1933 it added two parallel-twin models: the 600 cc S6 and 800 cc S8. Both twins have chain-driven OHC valvegear.

World War II interrupted motorcycle production, but Horex resumed in 1948 with a 350 cc single-cylinder model, the SB 35 Regina. In 1951, Horex added a 500 cc OHC parallel-twin engine called the Imperator. In 1954 it added a 400 cc version of this twin to its range. In 1955, the company replaced the Regina with the Resident.

Daimler-Benz took over the company in 1960 and motorcycle production was terminated.  1989 CK design in Japan developed Horex 644 OSCA with Fritz Roeth in Hammelbach , 644cc single cylinder sports , using Honda RFVC engine. made debut press conference in Berlin 1990 .

On June 15, 2010, it was announced that the brand would be revived and that a Horex motorcycle with a narrow-angle, six-cylinder supercharged engine would be available for sale in Germany, Austria and Switzerland at the end of the year 2011, with international sales to follow. Besides the new VR6 supercharged engine, an aluminum bridge frame with a steel steering head forms the chassis. A single swing arm controls the rear wheel, while the engine power is transferred by a belt drive system.

The company filed for bankruptcy in September 2014, and in late 2014 announced that all employees had been let go and the factory was closed.

3C-Carbon Group AG is going to the be the new owner of motorcycle brand Horex Last Thursday at the creditors' meeting, under the direction of the insolvency administrator, Rainer U. Müller from the law firm, Anchor Rechtsanwälte, the 3C-Carbon Group AG came out on top in the quest to purchase the Horex brand. (06. Februar 2015).

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