These are the known mechanical and performance specifications for your 1957 Simson 425 GS.
Basic Specs

Engine
Displacement247.00 ccm (15.07 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression
Bore/Stroke68.0 x 68.0 mm (2.7 x 2.7 inches)
Valves/Cylinder
FuelingCarburettor
IgnitionMagneto
Exhaust
Lubrication
CoolingAir
Drivetrain
Gearbox
Final DriveShaft drive (cardan)
Clutch
Driveline
Fuel Economy & Polution
Fuel Consumption3.30 litres/100 km (30.3 km/l or 71.28 mpg)
Fuel Capacity16.00 litres (4.23 gallons)
Emissions76.6 CO2 g/km. (CO2 - Carbon dioxide emission)
Chassis
Frame Type
Rake
Trail
Front SuspensionTelescopic
Front Travel
Rear SuspensionSwingarm
Rear Travel
SeatSingle
Seat Height
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance
Wheelbase
Dry Weight157.0 kg (346.1 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre3.5-19
Rear Tire/Tyre18-Apr
Front BrakesExpanding brake (drum brake)
Front Brake Diameter180 mm (7.1 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter180 mm (7.1 inches)
Wheels
Comments