Comparison of BMW R39 1927 and NSU 251 OSL WH 1938 [S]ave
| Attribute |  BMW R39 1927 × |  NSU 251 OSL WH 1938 × |
|---|---|---|
| General | ||
| Production from (year) | 1927 | 1938 |
| Make | BMW | NSU |
| Model | BMW R39 | NSU 251 OSL WH |
| Category | Naked bike | Allround |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor. 20mm BMW Spezial | Carburettor. Amal |
| Displacement (cm³) | 247 | 242 |
| Power (kw) | 4.4 | 7.7 |
| Cooling system | Air | Air |
| Transmission type,final drive | Shaft drive (cardan) | Chain |
| Bore (mm) | 68 | 64 |
| Stroke (mm) | 68 | 75 |
| Gearbox | 3-speed | - |
| Fuel control | Overhead Valves (OHV) | - |
| Clutch | Dry-single plate-cable operated | - |
| Lubrication system | Wet sump | - |
| Compression | 6.1:1 | - |
| Chassis | ||
| Front suspension | Leading link | - |
| Rear suspension | Rigid | - |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | - | Expanding brake (drum brake) |
| Frame type | Steel doble cradle | Steel |
| Front tyre | 3.5-27 | 3-19 |
| Rear tyre | 3.5-27 | 3-19 |
| Seat | - | Single |
| Wheels | - | Spoked |
| Other | ||
| Starter | - | Kick |
| Dimensions | ||
| Kerb weight (kg) | 110 | - |
| Dry weight (kg) | - | 144 |
| Power/weight ratio | - | 0.0535 |
| Overall height (mm) | 950 | 950 |
| Overall length (mm) | 2,050 | 2,040 |
| Overall width (mm) | 800 | 780 |
| Performance | ||
| Top speed (km/h) | 100 | 95 |
| Fuel capacity (l) | - | 11 |
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