The 1939 Servi-Cycle underwent major changes and differs in many respects from the '38. There were actually three different models produced in 1939: a DeLuxe model, which is the model most often associated with the Servi-Cycle name and is most closely related to previous and later designs; a Commercial model, which was the "no-frills" stripped-down version; and the Glide, a large-wheel step-through scooter design based on the Servi-Cycle. All three models incorporated the same engine design.
ENGINE
The engine serial number begins with "1939" followed by the sequential production order. The cylinder is a new round-shaped cast-iron piece, but retains the single spark plug design. Early '39's used the Eisemann magneto, while some late 39's had a small diameter Wico magneto.
CHASSIS
1939 is the first year for the larger seat pan and the seat now has the winged Servi-Cycle logo embossed on it. (The Commercial version retains the smaller seat design.) The most noticeable difference between the DeLuxe and the Commercial is the front fork design. The commercial uses a bicycle-style rigid front fork assembly, and has no front brake. The DeLuxe, on the other hand, has the signature four-spring Simplex front fork and a front brake. The front brake lever on the DeLuxe is located on the right handlebar, and the compression release lever is located on the left handlebar. A right side twist grip throttle is used.This is the last year for the center stand/footpeg assembly, and the first year for Simplex branded tires (manufactured in 1939 by Carlisle). Five inch diameter drum brakes are mounted to the 1" drop center rims.
The Glide uses the wheels from the Servi-Cycle models, but uses a step-through frame design.