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1954 Simplex Automatic Servi-Cycle

Buy it Now – $19,000 – Make an Offer

BK Auto Auctions presents this classic 1954 Simplex Automatic Servi-Cycle finished in an awesome classic blue. Powering this Simplex comes from a single-cylinder two-stroke engine with a belt directly driven off the engine to the rear wheel. This head turning Bike has the looks to get you where you’re going as an unrestored survivor of a legendary motorcycle with a unique southern history. This Simplex is being sold on a Bill of Sale.


Debuting in 1935, the first Servi-Cycle was an uncomplicated vehicle.  Power came from a single-cylinder two-stroke engine with a belt directly driven off the engine to the rear wheel.  That required riders to shut off the engine at every stop and re-start by pushing it.  Later advancements included adding a clutch and a kick-start mechanism.  The Simplex Automatic was introduced in 1953, utilizing a centrifugal clutch to allow a variable speed through the belt as engine RPM’s increased.

Treen had a rather unique philosophy, as he preferred to continually modify and refine his original design as opposed to other manufacturers who released new models annually, or at least every few years.  By the time production closed in 1960, the Servi-Cycle had changed very little cosmetically in the 25 years it was made.  As the only motorcycle manufacturer in the Deep South at that time, understood that working conditions in the hot, humid environment would be very uncomfortable so Treen installed air conditioning in the factory.  This not only improved working conditions, it served to keep employees long term and cut down on turnover.

By the late 1950’s, the Simplex design was very dated in terms of technology and design.  As imported motorcycles began to show an increased presence in the US market, Simplex ended manufacturing of the Serve-Cycle in 1960.  The company continued to manufacture mini-bikes and go-carts for more than a decade.  Treen sold the company in 1972 and it closed permanently in 1975.

In the late 1920’s Paul Treen was the successful owner of a Harley-Davidson motorcycle dealership in New Orleans, LA, with his shops sales accounting for two percent of the manufacturers sale thanks largely to his contracts with the Louisiana State Police.  Treen saw a market for a lighter weight, smaller motorcycle and made a pitch to Harley Davidson executives to produce such a model.  When that idea was rejected, Treen believed enough in his idea that he gathered a group of investors to form Simplex Manufacturing Company and began designing what would become the Simplex Servi-Cycle.

Year: 1954

Make: Simplex Automatic

Model: Servi-Cycle


Exterior Color: Bright Blue

Interior Color:

Engine: 1 Cyl

Odometer Reading:

Is the milage accurate?: Yes – Original Miles

Is The Engine Original: Yes

Transmission Type:

Vehicle Title: Bill of Sale

Location of Vehicle: Lebanon, Missouri

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