22 July. Wednesday 2026
BMW R 45 - 1981 Specifications and Reviews
The 1981 BMW R 45 is a lightweight naked bike powered by an air-cooled 473cc boxer twin, delivering 35 horsepower through shaft drive. Its manageable weight and modest power make it ideal for novice and recreational riders seeking reliable, economical transport. Known for BMW's legendary durability and low-maintenance engineering, the R 45 exemplifies practical European motorcycling.
General information | |
| Category | Naked bike |
| Year | 1981 |
| Model | BMW R 45 |
Engine and Transmission Specifications | |
| Transmission typefinal drive | Shaft drive (cardan) |
| Gearbox | 5-speed |
| Cooling system | Air |
| Fuel control | OHV |
| Valves per cylinder | 2 |
| Bore x stroke | 70.0 x 61.5 mm (2.8 x 2.4 inches) |
| Compression | 9.2:1 |
| Power | 35.00 |
| Stroke | 4 |
| Engine type | Two cylinder boxer |
| Capacity: | 473.00 ccm (28.86 cubic inches) |
| | |
Physical measures and capacities | |
| Weight incl. oil, gas, etc | 206.0 kg (454.2 pounds) |
| | |
BMW R 45 dimensions and frame | |
| Rear brakes | Expanding brake |
| Front brakes | Single disc |
| Rear tyre dimensions | 4.00-18 |
| Front tyre dimensions | 3.25-18 |
Speed and acceleration | |
| Top speed | 160.0 km/h (99.4 mph) |
Other specs | |
| Fuel capacity | 22.00 litres (5.81 gallons) |
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