DISRAELI GEARS

Kreis

German Patent 743,545 - Kreis main image German Patent 817,564 - Kreis main image German Patent 911,355 - Kreis main image

Fritz Kreis appears to have developed an automatic 2-speed derailleur system in the late 1930s, patenting it in 1940. He then went on to patent various refinements in the years up to 1950.

I believe that he was originally based in Chemnitz, home of many German bicycle companies. After the war Chemnitz was in the DDR (East Germany), and Fritz Kreis seems to have moved to W├╝rzburg in Bavaria, in the Bundesrepublik (West Germany). Here he appears to have set up a company to manufacture his magnificent device. His system was exhibited at the 1950 and 1951 Frankfurt Cycle Shows.

There is a small army of merry inventors who have developed automatic gear systems for bicycles. Fritz Kreis stands out from this jolly rabble (and justifies his place on this web site) because his system was really manufactured and really sold to real cyclists who may even have really used it. Respect!


see also German Patent # 743,545 - Kreis 1940

see also German Patent # 743,545 - Kreis 1940

German Patent 743,545 - Kreis thumbnail


see also German Patent # 911,355 - Kreis 1941

see also German Patent # 911,355 - Kreis 1941

German Patent 911,355 - Kreis thumbnail


see also German Patent # 817,564 - Kreis 1949

see also German Patent # 817,564 - Kreis 1949

German Patent 817,564 - Kreis thumbnail


see also German Patent # 817,565 - Kreis 1949

see also German Patent # 817,565 - Kreis 1949

German Patent 817,565 - Kreis thumbnail


see also German Patent # 850,406 - Kreis 1950

see also German Patent # 850,406 - Kreis 1950

German Patent 850,406 - Kreis thumbnail


see also Le Cycle 04/1950 - image of Kreis automatic

see also Le Cycle 04/1950 - image of Kreis automatic

  • Publisher: Le Cycle
  • Date: April 1950
  • Derailleur brands: Kreis
  • Derailleurs: Kreis automatic
Le Cycle 1950 04 - Kreis automatic thumbnail


see also VDI Nachrichten 11/1951 - Das Fahrrad und seine technischen Besonderheiten

see also VDI Nachrichten 11/1951 - Das Fahrrad und seine technischen Besonderheiten

VDI Nachrichten November 1951 - Das Fahrrad und seine technischen Besonderheiten scan 01 thumbnail