Information source: Simplex Servi-Cycle: America's Premier Lightweight Motorcycle, by Gary L. Wollard HISTORY
Simplex was the brainchild of J. Paul Treen, a Harley Davidson dealer in Baton Rouge, Louisiana in the early 1930's who recognized a need for a small, lightweight motorcycle. After developing several prototypes, Treen started production in 1935, producing twelve to fifteen units a week.
Over the years Simplex added more space and air-conditioned the entire production facility in 1944, making it one of the most up-to-date manufacturing concerns of the time. Music was broadcast at short intervals during the work day. Several articles have been published regarding Treen's ability to prove the South a viable production location.
The basic Simplex design changed little over its twenty five year life span. The first models were "direct drive", with a belt running from the end of the crankshaft directly to the rear wheel. Starting was accomplished by straddling the machine and taking a few brisk steps. The motion of the rear wheel turned the motor over, and you were on your way. A rocker clutch pedal was added in 1941, and the Automatic model was introduced in 1953. Along the way, other upgrades were incorporated, including a kick starter, magneto-driven lighting, and more. There were also several three-wheel trucks, used mostly by delivery services. The company stopped building the Servi-Cycle style models in 1960, and later produced scooters, go karts, and lawn mowers, powered by proprietary engines rather than their own.
More detailed history on each model can be found on the Model History pages.
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