BMW R39
1926Naked

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 1926 BMW R39, a classic naked bike that embodies the pioneering spirit of early 20th-century motorcycling. Positioned as a lightweight and accessible option for riders of that era, the R39 showcased BMW's commitment to engineering excellence and robust design. With its distinctive styling and a focus on practicality, this motorcycle became a favorite among those who appreciated both aesthetics and performance. As one of BMW's earlier models, the R39 laid the groundwork for the brand's storied legacy in the motorcycle world, appealing to enthusiasts who value history as much as they do horsepower. At the heart of the R39 lies a simple yet effective 247cc single-cylinder, four-stroke engine, delivering a modest 5.98 horsepower at 4000 RPM. It may not seem like much by today's standards, but this power translates into a respectable top speed of 100 km/h (62.1 mph), providing an exhilarating ride for the adventurous motorcyclist. The engine's 6.1:1 compression ratio and air-cooled design ensure reliability, while the 20mm BMW Spezial carburetor offers precise fuel delivery. Coupled with a 3-speed gearbox and a shaft drive, the R39 delivers smooth power transitions and an engaging riding experience, perfect for cruising through picturesque landscapes or navigating bustling city streets. The 1926 BMW R39 is not just about performance; it also features a robust steel double cradle frame that enhances stability and handling. The motorcycle is equipped with a leading link front suspension, providing a unique ride quality that was advanced for its time. The expanding drum brake in the front ensures adequate stopping power, while the rigid rear suspension maintains a classic aesthetic and simplicity. Weighing in at just 110 kg (242.5 lbs), this motorcycle is lightweight and agile, perfect for riders looking to maneuver with ease. The iconic kick starter is a nod to the engineering practices of the time, adding a touch of nostalgia to its operation. **

Pros

  • Lightweight Design: Weighing only 110 kg, the R39 is easy to handle, making it an excellent choice for both novice and experienced riders.
  • Classic Aesthetics: The vintage styling and unique engineering features appeal to motorcycle enthusiasts and collectors alike.
  • Reliable Performance: The air-cooled engine and shaft drive system provide dependable performance and low maintenance needs.

Cons

  • Limited Power: With only 5.98 HP, the R39 might feel underpowered compared to modern motorcycles, especially for those seeking speed.
  • Rigid Rear Suspension: While traditional, the rigid rear suspension may not provide the same comfort as contemporary designs with more advanced suspension systems.
  • Basic Technology: The simplicity of its features may not satisfy riders looking for modern conveniences and technological advancements found in today’s bikes.

Technical details

Source specification data

Make
BMW
Model
R39
Category
Naked bike
Starter
Kick
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)
Seat
Single seat
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