Comparison of NSU 251 SS 1929 and Zündapp Z 249 1923 [S]ave
| Attribute |  NSU 251 SS 1929 × |  Zündapp Z 249 1923 × |
|---|---|---|
| General | ||
| Production from (year) | 1929 | 1923 |
| Make | NSU | Zündapp |
| Model | NSU 251 SS | Zündapp Z 249 |
| Category | Sport | Sport |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, two-stroke |
| Fuel system | Carburettor | Carburettor |
| Displacement (cm³) | 247 | 249 |
| Power (kw) | 7.3 | 2 |
| Cooling system | Air | Air |
| Transmission type,final drive | Chain | Belt |
| Bore (mm) | 63 | 68 |
| Stroke (mm) | 80 | 82.5 |
| Gearbox | - | 3-speed |
| Chassis | ||
| Front suspension | - | Druid fork |
| Rear suspension | - | Rigid |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Front tyre | 2.50-26 | 2.25-24 |
| Rear tyre | 2.50-26 | 2.25-24 |
| Seat | Single | Single |
| Wheels | Spoked | Spoked |
| Other | ||
| Starter | Kick | - |
| Dimensions | ||
| Dry weight (kg) | 110 | 76 |
| Power/weight ratio | 0.0664 | 0.0263 |
| Performance | ||
| Top speed (km/h) | 100 | 70 |
| Fuel capacity (l) | - | 6.1 |
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