Positioned in Simplex's allround motorcycle lineup, the 1958 Simplex Automatic relies on a 130 cc (7.9 cu in) single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 4 HP (2.9 kW) at 5,000 rpm, transferring power to the rear wheel through belt final drive. With a specific output of 30.8 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the Automatic measures 61.2 kg (135 lbs) dry. The 9.46-liter (2.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Simplex archive, this model family spans 18 indexed model years from 1942 to 1960, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
