BMW R20
1937Allround

BMW R20

Key specifications

Engine
192 cc
Power
8 HP
Fuel type
petrol
Fuel capacity
3.2 L
Transmission
3-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1937 BMW R20, a timeless classic that perfectly encapsulates the spirit of pre-war motorcycling. As a member of BMW's illustrious lineup, the R20 was designed to be an allround motorcycle, appealing to both everyday riders and enthusiasts alike. With its blend of understated elegance and robust engineering, the R20 stands as a testament to BMW's commitment to quality and performance during an era marked by innovation. It was a bike crafted not just for transport, but for the adventure of riding itself, resonating with those who sought freedom on two wheels. At the heart of the R20 lies a compact yet potent single-cylinder, four-stroke engine with a displacement of 192cc. Producing just over 8 horsepower at 5400 RPM, this reliable powerplant allows the R20 to reach a top speed of 95 km/h (59 mph), making it a nimble companion on both city streets and open roads. The engine's 6.1:1 compression ratio and efficient carburettor fuel system ensure smooth power delivery, while the three-speed gearbox and shaft drive offer a seamless riding experience. Whether you're navigating through winding country lanes or cruising down the boulevard, the R20's lightweight frame at just 130 kg (286.6 pounds) enhances maneuverability, creating an engaging ride that is both spirited and enjoyable. The R20's design is not only visually appealing but also incorporates practical features that enhance its usability. The steel single cradle frame provides durability without sacrificing agility, while the telescopic front forks and rigid rear suspension contribute to a balanced ride. Equipped with 160mm drum brakes at both the front and rear, the R20 offers reliable stopping power, an essential feature for any rider. Additionally, the kickstarter adds a touch of nostalgia to the riding experience, inviting riders to connect with the motorcycle in a very personal way. With a fuel capacity of 12 liters (3.17 gallons), the R20 ensures you can cover good distances before needing to refuel, making it an excellent choice for weekend jaunts or leisurely rides. In summary, the 1937 BMW R20 is a remarkable motorcycle that combines classic design with solid engineering, making it a cherished piece of motorcycling history. Whether you're a seasoned collector or a newcomer to the world of vintage bikes, the R20 promises an engaging ride that celebrates the freedom of the open road.

Pros

  • Classic Styling: The R20's aesthetic captures the essence of 1930s motorcycling, appealing to vintage enthusiasts and collectors alike.
  • Lightweight and Agile: Weighing in at just 130 kg, the R20 offers excellent maneuverability, making it easy to handle in various riding conditions.
  • Reliable Performance: The air-cooled engine and shaft drive system provide dependable power and low maintenance, ideal for riders looking for a hassle-free experience.

Cons

  • Limited Power: With only 8.02 HP, the R20 may feel underpowered to modern riders accustomed to higher-performance motorcycles.
  • Basic Suspension Setup: The rigid rear suspension limits comfort on rougher terrain compared to modern bikes with advanced suspension systems.
  • Kickstart Only: The absence of an electric starter may deter some riders who prefer the convenience of modern starting systems, requiring a bit more effort to get going.

Technical details

Source specification data

Make
BMW
Model
R20
Category
Allround
Starter
Kick
Carrying Capacity
200kg
Power
8.02 HP (5.9 kW)) @ 5400 RPM
Clutch
Dry-multiplate-cable operated
Gearbox
3-speed
Ignition
Battery
Top Speed
95.0 km/h (59.0 mph)
Fuel System
Carburettor
Bore X Stroke
63.0 x 64.0 mm (2.5 x 2.5 inches)
Compression
6.1:1
Displacement
192.00 ccm (11.72 cubic inches)
Cooling System
Air
Engine Details
Single cylinder, four-stroke
Lubrication System
Wet sump
Transmission Type Final Drive
Shaft drive (cardan)
Fuel Capacity
12.00 litres (3.17 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
130.0 kg (286.6 pounds)
Seat
Solo seat with springs
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
160 mm (6.3 inches)
Front Brakes Diameter
160 mm (6.3 inches)