Back to Bike FinderYears: 1928 · 1927 · 1926
BMW R42
1926Allround

BMW R42

Key specifications

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

Overview

### Discovering the 1926 BMW R42: A Classic Allround Motorcycle The 1926 BMW R42 stands as a testament to early 20th-century engineering and design, embodying the spirit of adventure and innovation that BMW has come to represent. Positioned in the "Allround" category, the R42 was crafted for versatility, making it an ideal choice for both urban commuting and country excursions. With its distinctive styling and robust build, this motorcycle appeals not only to enthusiasts of vintage motorcycles but also to collectors eager to own a piece of history. The R42 marked BMW's foray into the motorcycle market, setting the stage for a legacy of performance and durability that continues to this day. At the heart of the R42 is its impressive two-cylinder boxer engine, boasting a displacement of 494 cc and a power output of nearly 12 HP at 3,400 RPM. This four-stroke powerhouse delivers a top speed of 95 km/h (59 mph), allowing riders to experience the thrill of the open road while maintaining a sense of stability and control. With a compression ratio of 4.9:1 and a bore and stroke of 68 mm each, the engine's design emphasizes balance and efficiency, making for a smooth riding experience. Coupled with a three-speed gearbox and a reliable shaft drive, the R42 effortlessly combines power and practicality, ensuring a comfortable ride whether you’re navigating city streets or exploring the countryside. The 1926 BMW R42 is packed with features that exemplify the technological advancements of its time. Its steel double cradle frame provides robust support, while the leading link front suspension enhances stability, making it suitable for various terrains. The classic drum brake, measuring 150 mm in diameter, offers reliable stopping power, and the rigid rear suspension contributes to a straightforward yet effective design ethos. Fuel efficiency is another highlight, with a consumption rate of just 3.00 liters per 100 km (approximately 78.41 mpg), allowing riders to enjoy long journeys without frequent fuel stops. The kick-starter adds a nostalgic charm, harking back to a simpler time when motorcycling was all about the thrill of the ride. ###

Pros

    Cons

    • Timeless Design: The R42's classic aesthetic continues to captivate motorcycle enthusiasts and collectors alike.
    • Fuel Efficiency: With an impressive consumption rate, the R42 allows for extended rides without constant refueling.
    • Solid Performance: The boxer engine delivers a balanced mix of power and stability, ensuring a smooth riding experience.
    • Limited Speed: While enjoyable, the top speed of 95 km/h may not satisfy those looking for high-performance thrills.
    • Basic Features: Modern riders may find the R42 lacks some contemporary conveniences such as electric start and advanced braking systems.
    • Rigid Rear Suspension: The lack of rear suspension may result in a less comfortable ride over rough terrain compared to modern bikes.

    Technical details

    Source specification data

    Make
    BMW
    Model
    R42
    Category
    Allround
    Starter
    Kick
    Carrying Capacity
    188kg
    Power
    11.96 HP (8.7 kW)) @ 3400 RPM
    Clutch
    Dry-single plate-cable operated
    Gearbox
    3-speed
    Top Speed
    95.0 km/h (59.0 mph)
    Fuel System
    Carburettor. 20mm BMW Spezial
    Bore X Stroke
    68.0 x 68.0 mm (2.7 x 2.7 inches)
    Compression
    4.9:1
    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)
    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
    126.0 kg (277.8 pounds)
    Seat
    Single seat
    Rear Tyre
    3.5-26
    Frame Type
    Steel doble cradle
    Front Tyre
    3.5-26
    Front Brakes
    Expanding brake (drum brake)
    Rear Suspension
    Rigid
    Front Suspension
    Leading link
    Front Brakes Diameter
    150 mm (5.9 inches)