Comparison of NSU 251 SS 1927 and NSU 351 OSL 1940 [S]ave
| Attribute |  NSU 351 OSL 1940 × |  NSU 251 SS 1927 × |
|---|---|---|
| General | ||
| Production from (year) | 1940 | 1927 |
| Make | NSU | NSU |
| Model | NSU 351 OSL | NSU 251 SS |
| Category | Sport | Sport |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor. Graetzin KE 25/43 | Carburettor |
| Displacement (cm³) | 346 | 247 |
| Power (kw) | 13.1 | 7.3 |
| Cooling system | Air | Air |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 75 | 63 |
| Stroke (mm) | 79 | 80 |
| Gearbox | 4-speed | 3-speed |
| 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 | - |
| Front tyre | 3.25-19 | 2.50-26 |
| Rear tyre | 3.25-19 | 2.50-26 |
| Seat | Single spring-mounted | Single |
| Wheels | Spoked | Spoked |
| Other | ||
| Starter | - | Kick |
| Dimensions | ||
| Wheelbase (mm) | 1,420 | 1,330 |
| Dry weight (kg) | 110 | 110 |
| Power/weight ratio | 0.1191 | 0.0664 |
| Performance | ||
| Top speed (km/h) | 110 | 100 |
| Fuel capacity (l) | - | 7.75 |
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