| MODEL | NSU 125 RENNFOX 1953 |
| Year | 1953 |
| Engine Type | Single cylinder, 4-stroke, single overhead camshaft driven by shaft and bevel gears |
| Displacement / Capacity | 123.6 cc |
| Bore X Stroke | 54 mm x 54 mm |
| Compression Ratio | — |
| Cooling System | Air |
| Max Power | 11.6 kW / 15.5 hp @ 10000 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | — |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4-speed |
| Clutch | — |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | Single tube frame with stamped plate |
| Front Suspension | Swinging-link |
| Rear Suspension | Telescopic |
| Front Brakes | Central drum, double cam |
| Rear Brakes | Central drum, double cam |
| 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 | About 160 km/h / 100 mph |
NSU's 125 cc Grand Prix racer. The 1953 version used a lighter single-shaft valve drive than the 1952 original, and in that year Werner Haas took the 125 world title on it. A modified six-speed version won everything in 1954 for Rupert Hollaus.
