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

BMW R42

Key specifications

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

Overview

Introducing the 1928 BMW R42: A Classic Allrounder Step back in time to the late 1920s, when motorcycling was transforming into a thrilling mode of transportation, and meet the BMW R42. Launched in 1928, this iconic model signified a pivotal moment for BMW as it entered the motorcycle market with a robust and versatile design. Positioned as an allround motorcycle, the R42 was engineered to cater to a vast array of riders—from casual enthusiasts to those seeking spirited rides across the open road. Its classic styling, paired with BMW’s commitment to quality, quickly established the R42 as a respected choice among motorcyclists of the era. At the heart of the R42 lies its impressive 494cc two-cylinder boxer engine, which delivers a respectable 11.96 horsepower at 3,400 RPM. This four-stroke powerhouse, with a balanced bore and stroke of 68mm, is renowned for its distinctive sound and character. Riders will appreciate the smooth power delivery and the capability to reach a top speed of 95 km/h (59 mph), making it suitable for both city commuting and weekend getaways. The 3-speed gearbox and shaft drive offer a reliable and engaging riding experience, while the air-cooled system ensures longevity even during extended journeys. The R42’s rigid rear suspension contributes to its vintage charm, providing a ride that feels connected to the road. The BMW R42 is not just about raw power; it also boasts several features that highlight the ingenuity of its time. The steel double cradle frame ensures stability and durability, while the leading-link front suspension enhances cornering capabilities. The expanding drum brakes, with a diameter of 150 mm, offer sufficient stopping power, a necessity in an era when brakes were still evolving. Complemented by a kick starter, the R42 seamlessly blends simplicity with function, making it a reliable companion for any ride. Whether you're cruising through town or embarking on an adventure, the R42 stands as a testament to BMW's engineering prowess and commitment to rider satisfaction. **

Pros

    Cons

    • Timeless Design: The classic aesthetics and iconic BMW styling make it a coveted piece for collectors and enthusiasts alike.
    • Reliable Engine: The boxer engine configuration offers smooth performance and a uniquely engaging riding experience.
    • Sturdy Construction: Built with a robust steel frame and solid components, the R42 is designed to withstand the rigors of the road.
    • Limited Speed and Power: While it offers decent performance for its time, modern standards may find the R42 lacking in acceleration and top speed.
    • Rigid Suspension: The rear rigid suspension can lead to a less comfortable ride on bumpy roads compared to modern motorcycles with advanced suspension systems.
    • Basic Features: Lacking modern conveniences such as electric start and advanced braking systems, the R42 requires a more hands-on approach to riding and maintenance.

    Technical details

    Source specification data

    Make
    BMW
    Model
    R42
    Category
    Allround
    Starter
    Kick
    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
    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)