These are the known mechanical and performance specifications for your 1957 Simplex Automatic.
Displacement130.00 ccm (7.93 cubic inches)
DetailsSingle cylinder, two-stroke
Bore/Stroke50.8 x 64.3 mm (2.0 x 2.5 inches)
Fuel Economy & Polution
Fuel Capacity9.46 litres (2.50 gallons)
Front SuspensionLeading link
Alt. Seat Height
Wheelbase1,194 mm (47.0 inches)
Dry Weight61.2 kg (135.0 pounds)
Wheels & Brakes
Front Brake Diameter
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter
It appears you're interested in specifications for the Simplex Automatic. This Allround model is powered by a Single cylinder, two-stroke engine with 130.00 ccm (7.93 cubic inches) of actual displacement before 6.5:1 compression. Fueling is metered via Carburettor allowing this machine to produce its 4.00 HP (2.9 kW) horsepower and torque. According to our records engine heat of the Simplex Automatic is moderated by . You'll need to get familiar with the transmission and pay attention to final drive Belt maintainence. Our best information shows that the front tire size is and the rear is . The entire package is supported by the frame, . We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on front brakes and Expanding brake (drum brake) rear brakes. The Simplex Automatic was launched in 1957, and we're happy to know (or assume) you've got one in your garage. To help you keep your ride in tip-top shape, consider purchasing an owner or service manual.