Back to Bike FinderYears: 1940 · 1939 · 1938
BMW R23
1939Allround

BMW R23

Key specifications

Engine
247 cc
Power
10 HP
Fuel type
petrol
Fuel capacity
2.5 L
Transmission
3-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

The 1939 BMW R23 stands as a testament to the artistry and engineering prowess of early 20th-century motorcycle design. Positioned in the allround category, this bike appeals to a diverse range of riders, from the casual commuter to the adventurous weekend tourer. With its classic aesthetic and robust functionality, the R23 embodies the spirit of a bygone era while offering the reliability that BMW motorcycles are renowned for. As World War II loomed, the R23 captured the essence of an age where motorcycles were not just machines but symbols of freedom and individuality. At the heart of the R23 lies a single-cylinder, four-stroke engine with a displacement of 247 cc, producing a respectable 10.06 horsepower at 5,400 RPM. This power plant is designed for spirited yet manageable performance, allowing riders to reach a top speed of 95 km/h (59 mph). The engine’s 6.1:1 compression ratio, along with a meticulous bore and stroke of 68 mm, ensures smooth acceleration and reliable torque. Coupled with a three-speed gearbox and a shaft drive system, the R23 delivers an engaging riding experience that is both responsive and enjoyable. Whether navigating city streets or cruising along open roads, the R23 showcases a harmonious balance of power and control. The R23 is not just about engine performance; it is also equipped with features that underline its engineering sophistication. Its steel single cradle frame provides robust stability, while the telescopic front fork and rigid rear suspension work together to offer a comfortable ride, absorbing the bumps of uneven roads. The bike’s braking system employs expanding drum brakes both front and rear, with diameters of 160 mm and 180 mm respectively, ensuring adequate stopping power. Furthermore, the kick starter adds a nostalgic touch that harkens back to simpler times, allowing riders to engage with their machine in an intimate and satisfying manner. **

Pros

  • Classic Aesthetic: The timeless design of the R23 appeals to vintage motorcycle enthusiasts and collectors alike.
  • Reliable Performance: The single-cylinder engine offers dependable power and a smooth riding experience suitable for daily commuting and leisurely rides.
  • Sturdy Build Quality: The robust steel frame and quality construction contribute to the bike’s longevity and resilience on the road.

Cons

  • Limited Power: With only 10.06 HP, the R23 may struggle to keep up with modern traffic speeds, making it less ideal for highway use.
  • Rigid Rear Suspension: While it offers stability, the rigid rear can lead to a less comfortable ride on rough terrain compared to more modern suspension systems.
  • Minimal Gear Options: The three-speed gearbox may feel limiting for riders accustomed to more advanced transmission systems, potentially reducing versatility in varying riding conditions.

Technical details

Source specification data

Make
BMW
Model
R23
Category
Allround
Starter
Kick
Carrying Capacity
200kg
Power
10.06 HP (7.3 kW)) @ 5400 RPM
Clutch
Single plate dry
Gearbox
3-speed
Ignition
Battery
Top Speed
95.0 km/h (59.0 mph)
Fuel System
Carburettor. Amal
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)
Fuel Capacity
9.60 litres (2.54 gallons)
Overall Width
800 mm (31.5 inches)
Overall Height
900 mm (35.4 inches)
Overall Length
2,000 mm (78.7 inches)
Weight Incl Oil Gas Etc
135.0 kg (297.6 pounds)
Rear Tyre
2.99-19
Frame Type
Steel-single cradlel
Front Tyre
2.99-19
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
Rigid
Front Suspension
Telescopic fork
Rear Brakes Diameter
180 mm (7.1 inches)
Front Brakes Diameter
160 mm (6.3 inches)