These are the known mechanical and performance specifications for your 1936 DKW SB 500.
Basic Specs

Engine
Displacement493.90 ccm (30.14 cubic inches)
Type
DetailsTwin, two-stroke
Max RPM
Compression5.7:1
Bore/Stroke68.0 x 68.0 mm (2.7 x 2.7 inches)
Valves/Cylinder
FuelingCarburettor. Amal
Ignition
Exhaust
Lubrication
CoolingAir
Performance
Horespower15.00 HP (10.9 kW)
Torque
Top Speed115.0 km/h (71.5 mph)
Fuel Economy & Polution
Fuel Consumption3.50 litres/100 km (28.6 km/l or 67.21 mpg)
Fuel Capacity13.00 litres (3.43 gallons)
Emissions81.2 CO2 g/km. (CO2 - Carbon dioxide emission)
Chassis
Frame Type
Rake
Trail
Front Suspension
Front Travel
Rear SuspensionRigid
Rear Travel
Seat
Seat Height
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance
Wheelbase
Dry Weight165.0 kg (363.8 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre3.5-19
Rear Tire/Tyre3.5-19
Front BrakesExpanding brake (drum brake)
Front Brake Diameter
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter
Wheels
Comments