Geier began operations in Lengerich Germany in the early 1900s producing bicycle frames. In the early 1930s they began producing their first motorcycles which utilized 74cc Sachs engines. However, their trikes proved to be much more popular. The motorized tricycles were used for deliveries and even as people carriers. The trikes were equipped with 125cc Ilo engines, and later with more powerful DKW engines. After the war, the company resumed production in 1948 with basic motorcycles bearing 98cc Ilo engines, and then telescopic forks in 1949. However, mopeds were their bigger seller, and they continued production until 1953 when declining sales made them no longer viable. Geier did continue to produce machines for other manufacturers into the 1960s.