Comparison of NSU 251 OSL 1938 and NSU 251 OSL 1937 [S]ave
| Attribute |  NSU 251 OSL 1938 × | NSU 251 OSL 1937 × |
|---|---|---|
| General | ||
| Production from (year) | 1938 | 1937 |
| Make | NSU | NSU |
| Model | NSU 251 OSL | NSU 251 OSL |
| Category | Sport | Sport |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor | Carburettor |
| Displacement (cm³) | 242 | 242 |
| Power (kw) | 7.7 | 7.7 |
| Fuel consumption (l/100km) | - | 2.3 |
| Cooling system | Air | Air |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 64 | 64 |
| Stroke (mm) | 75 | 75 |
| Gearbox | 4-speed | 4-speed |
| Greenhouse gases | - | 53.4 CO2 g/km. (CO2 - Carbon dioxide emission) |
| Ignition | Battery-Bosch | Battery-Bosch |
| Chassis | ||
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Frame type | Open double steel | Open double steel |
| Front tyre | 3-19 | 3-19 |
| Rear tyre | 3-19 | 3-19 |
| Seat | Single spring-mounted | Single spring-mounted |
| Wheels | Spoked | Spoked |
| Other | ||
| Starter | Kick | Kick |
| Dimensions | ||
| Wheelbase (mm) | 1,285 | 1,285 |
| Dry weight (kg) | 126 | 126 |
| Power/weight ratio | 0.0611 | 0.0611 |
| Overall height (mm) | 1,000 | 1,000 |
| Overall length (mm) | 2,000 | 2,000 |
| Overall width (mm) | 760 | 760 |
| Performance | ||
| Top speed (km/h) | 100 | 100 |
| Fuel capacity (l) | 11.5 | 11.5 |
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