Naked Motorcycles
1980BMW R 45
19 fields on record
The 1980 BMW R 45 is a lightweight touring motorcycle powered by an air-cooled 473cc boxer twin, delivering 35 horsepower. Well-suited for practical riders seeking reliable, economical long-distance travel, it's characterized by its shaft-drive efficiency and manageable weight. Known for BMW's legendary dependability and smooth ride quality, the R 45 remains a favorite among vintage motorcycle enthusiasts.
- Capacity
- 473.0 ccm
- Engine
- Boxer
- Gearbox
- 5-speed
- Wet weight
- 206.0 kg
- Seat height
- Not on record
Know it? Add it → - Power
- 35.0 HP (25.7 kW) @ 7250 RPM
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- A classic entry-level boxer twin meant for relaxed commuting, learning, and light weekend rides rather than outright performance.
- Built for
- An honest, mechanically simple air-cooled boxer with charming shaft-drive smoothness and old-school BMW build quality.
- Not ideal for
- Not for riders seeking strong acceleration, high top speed, or any serious off-road capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 473.0 ccm
- Power
- 35.0 HP (25.7 kW) @ 7250 RPM
- Engine type
- Boxer
- Power/weight ratio
- 0.1699 HP/kg
- Bore x stroke
- 70.0 x 61.5 mm
- Compression
- 9.2:1
- Cooling system
- Air
- Valves per cylinder
- 2
- Torque
- Not on record - add it
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Shaft
Performance
- Top speed
- 160.0 km/h (99.4 mph)
Dimensions & weight
Brakes & wheels
- Front brakes
- Single disc
- Rear brakes
- Expanding brake
- Front tyre
- 3.25-18
- Rear tyre
- 4.00-18
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 1980 | 1981 | 1982 | 1983 | 1984 |
|---|---|---|---|---|---|
| Capacity | 473 cc | 473 cc | 473 cc | 473 cc | 473 cc |
| Fuel capacity | 22 L | 22 L | 22 L | 22 L | 22 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the BMW R 45?
The 1980 BMW R 45 has a Capacity of 473.0 ccm (28.86 cubic inches).
What engine power does the BMW R 45 have?
The 1980 BMW R 45 has a Power of 35.0 HP (25.7 kW) @ 7250 RPM.
How many gears does the BMW R 45 have?
The 1980 BMW R 45 has a Gearbox of 5-speed.
How much does the BMW R 45 weigh?
The 1980 BMW R 45 has a Wet weight of 206.0 kg (454.2 pounds).
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