Cyclemotors.

Cyclemotors are devices attached to a bicycle to provide motive power. The earliest motorcycles could be described as cyclemotors, but the term is usually applied to the devices produced from the late forties to the mid fifties for attachment to ones existing bike to provide the simplest, and cheapest form of powered personal travel. There were many types produced in Britain, the most common being Cyclemaster, Mini-Motor, Power-Pak, B.S.A. Winged Wheel, Vincent Firefly. In Europe, there were dozens of types produced, and machines were also produced in the East, and in the U.S.A. Engine sizes varied from 18cc to 50cc, and two stroke, four stroke and diesel designs were available. There was at least one attempt to produce a rotary engine, the complex Tube Investment's PowerWheel. The Cyclemotors were superseded by the Mopeds with better brakes, tyres, and performance.