BMW R39
1927Naked

BMW R39

Key specifications

Engine
247 cc
Power
6 HP
Fuel type
petrol
Transmission
3-speed
Front brakes
Expanding brake (drum brake)

Overview

### Introducing the 1927 BMW R39: A Classic Naked Bike Step back in time to the roaring twenties, when motorcycles began to capture the imagination of riders worldwide. Enter the 1927 BMW R39, a stunning representation of early German engineering and design. As a naked bike, the R39 was positioned to appeal to those who craved an unadulterated riding experience, combining performance with simplicity. This motorcycle is not just a means of transportation; it is a symbol of freedom and adventure, making it a coveted piece for collectors and vintage motorcycle enthusiasts alike. ### Engine Performance and Riding Characteristics At the heart of the R39 lies a robust 247cc single-cylinder, four-stroke engine, which produces a respectable 5.98 horsepower at 4,000 RPM. While it may not seem like a powerhouse by today’s standards, this motorcycle's lightweight frame—tipping the scales at just 110 kg (242.5 pounds)—ensures that it delivers an exhilarating ride. With a top speed of 100 km/h (62.1 mph), the R39 offers a delightful blend of agility and stability, allowing riders to navigate both urban streets and winding country roads with ease. The three-speed gearbox coupled with a shaft drive provides seamless power delivery, giving riders confidence in their maneuvers. ### Key Features and Technology The R39 showcases a steel double cradle frame, which not only contributes to its rigidity but also offers a classic aesthetic that stands the test of time. The leading link front suspension offers improved handling and stability, particularly during turns, while the rigid rear suspension maintains the bike's simplicity and enhances its classic look. Equipped with a 20mm BMW Spezial carburettor and an air-cooling system, this vintage gem emphasizes mechanical purity and reliability. The expanding drum brakes provide adequate stopping power for the era, although modern standards may leave riders wanting more in terms of braking performance. ###

Pros

    Cons

    • Classic Aesthetic: The design and engineering encapsulate the charm of the late 1920s, making it a great addition to any vintage motorcycle collection.
    • Lightweight and Agile: Weighing only 110 kg, the R39 is nimble and easy to handle, perfect for both novice and experienced riders looking for a classic experience.
    • Simplicity in Mechanics: With a straightforward engine and minimal electronic components, the R39 is easy to maintain for those who appreciate hands-on care.
    • Limited Power Output: With only 5.98 HP, it may not satisfy those seeking high-performance thrills typical of modern motorcycles.
    • Basic Braking System: The drum brakes may feel inadequate compared to contemporary disc brakes, requiring more care when slowing down.
    • Rigid Rear Suspension: While it adds to the classic look, the rigid rear suspension can result in a less comfortable ride over bumpy terrain.

    Technical details

    Source specification data

    Make
    BMW
    Model
    R39
    Category
    Naked bike
    Power
    5.98 HP (4.4 kW)) @ 4000 RPM
    Clutch
    Dry-single plate-cable operated
    Gearbox
    3-speed
    Top Speed
    100.0 km/h (62.1 mph)
    Fuel System
    Carburettor. 20mm BMW Spezial
    Bore X Stroke
    68.0 x 68.0 mm (2.7 x 2.7 inches)
    Compression
    6.1:1
    Displacement
    247.00 ccm (15.07 cubic inches)
    Cooling System
    Air
    Engine Details
    Single cylinder, four-stroke
    Lubrication System
    Wet sump
    Transmission Type Final Drive
    Shaft drive (cardan)
    Overall Width
    800 mm (31.5 inches)
    Overall Height
    950 mm (37.4 inches)
    Overall Length
    2,050 mm (80.7 inches)
    Weight Incl Oil Gas Etc
    110.0 kg (242.5 pounds)
    Rear Tyre
    3.5-27
    Frame Type
    Steel doble cradle
    Front Tyre
    3.5-27
    Front Brakes
    Expanding brake (drum brake)
    Rear Suspension
    Rigid
    Front Suspension
    Leading link