
BMW R25 3
Key specifications
Overview
Introducing the 1955 BMW R25/3: A Timeless Classic The 1955 BMW R25/3 stands as a remarkable embodiment of post-war motorcycle engineering, representing the pinnacle of BMW's allround category during its time. With its elegant lines and robust build, this motorcycle appeals to enthusiasts who appreciate a blend of historical significance and mechanical reliability. As a quintessential example of mid-20th century German craftsmanship, the R25/3 is not just a means of transport; it's a piece of motorcycling history that has earned its place in the hearts of collectors and riders alike. Engine Performance and Riding Characteristics At the heart of the R25/3 lies a spirited 247cc single-cylinder, four-stroke engine, which produces a respectable 13.05 horsepower at 5,800 RPM. This power output translates into a top speed of 88 km/h (54.7 mph), making it well-suited for leisurely rides through scenic countryside or city streets. The engine’s air-cooling system and efficient Bing carburettor contribute to its user-friendly nature, allowing riders to enjoy an impressive fuel consumption rate of just 2.90 litres per 100 km (approximately 81.11 mpg). The 4-speed gearbox, paired with a shaft drive, offers smooth power delivery and minimal maintenance, ensuring that the ride is both enjoyable and reliable. Key Features and Technology The R25/3 features a closed steel loop-welded frame, providing strength and stability while maintaining a modest weight of 150 kg (330.7 pounds). Its compact dimensions—including a seat height of 730 mm (28.7 inches)—make it accessible for riders of various sizes. The front and rear drum brakes, each with a diameter of 160 mm (6.3 inches), deliver dependable stopping power. The motorcycle is equipped with telescopic rear suspension and cartridge front suspension, which contribute to a comfortable ride over diverse terrains. Additionally, the kick starter adds a nostalgic touch, reflecting the era's mechanical charm while also providing reliability in starting the engine. **
Pros
Cons
- Fuel Efficiency: With a remarkable fuel consumption of 2.90 litres per 100 km, the R25/3 is economical for long rides.
- Classic Design: Its vintage aesthetics and robust build make it a sought-after collectible among motorcycle enthusiasts.
- User-Friendly Performance: The single-cylinder engine and smooth shaft drive make it approachable for both novice and experienced riders.
- Limited Top Speed: The maximum speed of 88 km/h may not satisfy those seeking high-performance thrills.
- Drum Brakes: While adequate for its time, the drum braking system may feel less responsive compared to modern disc brakes.
- Kick Start: The absence of an electric start can be a drawback for those accustomed to the convenience of modern motorcycles.
Technical details
Source specification data
- Make
- BMW
- Model
- R25 3
- Category
- Allround
- Starter
- Kick
- Carrying Capacity
- 320kg
- Power
- 13.05 HP (9.5 kW)) @ 5800 RPM
- Clutch
- Single plate dry-cable operated
- Gearbox
- 4-speed
- Ignition
- Battery
- Top Speed
- 88.0 km/h (54.7 mph)
- Fuel System
- Carburettor. Bing
- Bore X Stroke
- 68.0 x 68.0 mm (2.7 x 2.7 inches)
- Compression
- 7.1:1
- Displacement
- 247.00 ccm (15.07 cubic inches)
- Cooling System
- Air
- Engine Details
- Single cylinder, four-stroke
- Fuel Consumption
- 2.90 litres/100 km (34.5 km/l or 81.11 mpg)
- Greenhouse Gases
- O2
- g/km. (
- O2
- -
- Carbon
- dioxide emission)
- Lubrication System
- Wet sump
- Transmission Type Final Drive
- Shaft drive (cardan)
- Seat Height
- 730 mm (28.7 inches) If adjustable, lowest setting.
- Fuel Capacity
- 12.00 litres (3.17 gallons)
- Overall Width
- 760 mm (29.9 inches)
- Overall Height
- 710 mm (28.0 inches)
- Overall Length
- 2,065 mm (81.3 inches)
- Ground Clearance
- 92 mm (3.6 inches)
- Weight Incl Oil Gas Etc
- 150.0 kg (330.7 pounds)
- Rear Tyre
- 3.27-18
- Frame Type
- Closed steel loop-welded
- Front Tyre
- 3.27-18
- Rear Brakes
- Expanding brake (drum brake)
- Front Brakes
- Expanding brake (drum brake)
- Rear Suspension
- Telscopic
- Front Suspension
- Cartridge
- Rear Brakes Diameter
- 160 mm (6.3 inches)
- Front Brakes Diameter
- 160 mm (6.3 inches)