Back to Bike FinderYears: 1926 · 1925 · 1924 · 1923
BMW R32
1925Naked

BMW R32

Key specifications

Engine
494 cc
Power
9 HP
Fuel type
petrol
Fuel capacity
3.7 L
Transmission
3-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

### The Classic Elegance of the 1925 BMW R32 The 1925 BMW R32 is a milestone in motorcycle history, representing the brand's entry into the world of powered two-wheelers. As a naked bike, it embraces simplicity and functionality, focusing on the raw pleasure of riding. With its clean lines and robust design, the R32 quickly carved out a niche for itself among enthusiasts and collectors alike. This motorcycle is not just a means of transportation; it’s a piece of art that encapsulates the spirit of its era while laying the groundwork for future BMW models. At the heart of the R32 lies a remarkable 494cc two-cylinder boxer engine, later becoming a signature feature for the brand. Producing 8.57 horsepower at 3200 RPM, the engine may seem modest by today’s standards, but it delivers an exhilarating ride with a top speed of 95 km/h (59 mph). The balanced bore and stroke of 68mm each and a compression ratio of 5.1:1 create a smooth power delivery, making it a joy to ride through the winding roads of the early 20th century. With a three-speed gearbox and a shaft drive system, the R32 provides a uniquely engaging riding experience, allowing enthusiasts to appreciate the mechanical simplicity and reliability that define BMW's engineering philosophy. The 1925 R32 features a steel double cradle frame, which provides a robust yet lightweight structure, weighing in at just 122 kg (269 pounds) when fully fueled. The front and rear drum brakes, each measuring 150mm, offer adequate stopping power for the time, while the leading link front suspension ensures stability and comfort over uneven surfaces. The 14-liter fuel tank affords riders a respectable range, further enhancing its practicality for both short jaunts and longer adventures. With its kickstarter and air-cooled engine, the R32 embodies the charm and reliability of early motorcycling technology, making it a favorite for vintage motorcycle enthusiasts. ####

Pros

    Cons

    • Iconic Design: The naked bike aesthetic and classic lines make it a timeless piece of motorcycle history.
    • Robust Engineering: The boxer engine and shaft drive system contribute to reliability and low maintenance.
    • Excellent Fuel Efficiency: With a consumption rate of just 3.00 liters per 100 km (78.41 mpg), it’s economical for its era.
    • Limited Power Output: The 8.57 HP may feel underwhelming for modern riders seeking performance.
    • Basic Braking System: Drum brakes, while effective for their time, may not offer the stopping power expected by today’s standards.
    • Manual Kickstart: The absence of an electric starter can be a challenge for those accustomed to modern conveniences.

    Technical details

    Source specification data

    Make
    BMW
    Model
    R32
    Category
    Naked bike
    Starter
    Kick
    Carrying Capacity
    184kg
    Power
    8.57 HP (6.3 kW)) @ 3200 RPM
    Clutch
    Single plate dry-cable operated
    Gearbox
    3-speed
    Ignition
    Magneto
    Top Speed
    95.0 km/h (59.0 mph)
    Fuel System
    Carburettor. 22 BMW Spezial
    Bore X Stroke
    68.0 x 68.0 mm (2.7 x 2.7 inches)
    Compression
    5.1:1
    Displacement
    494.00 ccm (30.14 cubic inches)
    Cooling System
    Air
    Engine Details
    Two cylinder boxer, four-stroke
    Fuel Consumption
    3.00 litres/100 km (33.3 km/l or 78.41 mpg)
    Greenhouse Gases
    O2
    g/km. (
    O2
    -
    Carbon
    dioxide emission)
    Lubrication System
    Wet sump
    Transmission Type Final Drive
    Shaft drive (cardan)
    Fuel Capacity
    14.00 litres (3.70 gallons)
    Overall Width
    800 mm (31.5 inches)
    Overall Height
    950 mm (37.4 inches)
    Overall Length
    2,100 mm (82.7 inches)
    Weight Incl Oil Gas Etc
    122.0 kg (269.0 pounds)
    Seat
    Spring-mounted seat
    Rear Tyre
    2.99-26
    Frame Type
    Steel doble cradle
    Front Tyre
    2.99-26
    Rear Brakes
    Expanding brake (drum brake)
    Front Brakes
    Expanding brake (drum brake)
    Front Suspension
    Leading link
    Rear Brakes Diameter
    150 mm (5.9 inches)
    Front Brakes Diameter
    150 mm (5.9 inches)