| MODEL | NSU 4 HP 1920 - 1925 |
| Year | 1920 - 1925 |
| Engine Type | V-twin, 4-stroke |
| Displacement / Capacity | 498 cc / 30.4 cu in |
| Bore X Stroke | — |
| Compression Ratio | — |
| Cooling System | Air-cooled |
| Max Power | 6.8 kW / 6.5 hp @ 3000 rpm |
| Max Torque | — |
| Ignition | Magneto |
| Induction | — |
| Start System | Starter crank with freewheel |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | — |
| Final Drive | Belt |
| CHASSIS SPECS | |
| Frame | Steel, open frame with engine as stressed part |
| Front Suspension | Spring-loaded fork |
| Rear Suspension | Dual coil springs |
| Front Brakes | — |
| Rear Brakes | Adjustable expansion brake |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 80 km/h / 50 mph |
A belt-driven V-twin developed from the wartime 3.5 hp military machine. It was NSU's first post-war twin with a sprung front fork, got an adjustable expansion rear brake, and was finished in black with a green tank.
