Comparison of BMW R2 Series2a and BMW R20 1937 [S]ave
| Attribute |  BMW R2 Series2a × |  BMW R20 1937 × |
|---|---|---|
| General | ||
| Production from (year) | 1932 | 1937 |
| Make | BMW | BMW |
| Model | BMW R2 Series2a | BMW R20 |
| Category | Allround | Allround |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor. Amal | Carburettor |
| Displacement (cm³) | 198 | 192 |
| Power (kw) | 4.4 | 5.9 |
| Fuel consumption (l/100km) | 2 | - |
| Cooling system | Air | Air |
| Transmission type,final drive | Shaft drive (cardan) | Shaft drive (cardan) |
| Bore (mm) | 63 | 63 |
| Stroke (mm) | 64 | 64 |
| Gearbox | 3-speed | 3-speed |
| Greenhouse gases | 46.4 CO2 g/km. (CO2 - Carbon dioxide emission) | - |
| Fuel control | Overhead Valves (OHV) | Overhead Valves (OHV) |
| Ignition | Battery | Battery |
| Clutch | Dry-single plate-cable operated | Dry-multiplate-cable operated |
| Lubrication system | Wet sump | Wet sump |
| Compression | 6.7:1 | 6.1:1 |
| Chassis | ||
| Front suspension | Cartridge | Telescopic fork |
| Rear suspension | Rigid | Rigid |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Diameter (mm) | 180 | 160 |
| Frame type | Pressed steel duplex | Steel-single cradlel |
| Front tyre | 2.99-25.00 | 2.99-19 |
| Rear tyre | 2.99-25.00 | 2.99-19 |
| Seat | Solo seat with springs | Solo seat with springs |
| Other | ||
| Starter | Kick | Kick |
| Carrying capacity | 200kg | 200kg |
| Dimensions | ||
| Wheelbase (mm) | 1,320 | 1,330 |
| Kerb weight (kg) | 130 | 130 |
| Overall height (mm) | 950 | 900 |
| Overall length (mm) | 1,950 | 2,000 |
| Overall width (mm) | 850 | 800 |
| Performance | ||
| Top speed (km/h) | 95 | 95 |
| Fuel capacity (l) | 11 | 12 |
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