Back to Bike FinderYears: 1956 · 1955 · 1954 · 1953
BMW R25 3
1955Allround

BMW R25 3

Key specifications

Engine
247 cc
Power
13 HP
Fuel type
petrol
Fuel capacity
3.2 L
Transmission
4-speed
Seat height
29 mm
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

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)