Comparison of BMW R39 1927 and BMW R39 1926 [S]ave
| Attribute |  BMW R39 1927 × | BMW R39 1926 × |
|---|---|---|
| General | ||
| Production from (year) | 1927 | 1926 |
| Make | BMW | BMW |
| Model | BMW R39 | BMW R39 |
| Category | Naked bike | Naked bike |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor. 20mm BMW Spezial | Carburettor. 20mm BMW Spezial |
| Displacement (cm³) | 247 | 247 |
| Power (kw) | 4.4 | 4.4 |
| Cooling system | Air | Air |
| Transmission type,final drive | Shaft drive (cardan) | Shaft drive (cardan) |
| Bore (mm) | 68 | 68 |
| Stroke (mm) | 68 | 68 |
| Gearbox | 3-speed | 3-speed |
| Fuel control | Overhead Valves (OHV) | Overhead Valves (OHV) |
| Clutch | Dry-single plate-cable operated | Dry-single plate-cable operated |
| Lubrication system | Wet sump | Wet sump |
| Compression | 6.1:1 | 6.1:1 |
| Chassis | ||
| Front suspension | Leading link | Leading link |
| Rear suspension | Rigid | Rigid |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Frame type | Steel doble cradle | Steel doble cradle |
| Front tyre | 3.5-27 | 3.5-27 |
| Rear tyre | 3.5-27 | 3.5-27 |
| Seat | - | Single seat |
| Other | ||
| Starter | - | Kick |
| Dimensions | ||
| Kerb weight (kg) | 110 | 110 |
| Overall height (mm) | 950 | 950 |
| Overall length (mm) | 2,050 | 2,050 |
| Overall width (mm) | 800 | 800 |
| Performance | ||
| Top speed (km/h) | 100 | 100 |
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