BMW R51 1939 - Specifications & Review

R51

Article Complete Info

Articleid678123
CategoryAllround
MakeBMW
ModelR51
Year1939

Chassis, Suspension, Brakes & Wheels

FrametypeSteel single cradle
FrontbrakesExpanding brake (drum brake)
Frontbrakesdiameter200 mm (7.9 inches)
FrontsuspensionCartridge
Fronttyre3.50-19.00
RearbrakesExpanding brake (drum brake)
Rearbrakesdiameter200 mm (7.9 inches)
RearsuspensionTwin shock-Swingarm
Reartyre3.50-19.00
SeatSingle seat

Engine & Transmission

Borexstroke68.0 x 68.0 mm (2.7 x 2.7 inches)
ClutchDry-single plate-cable operated
Compression6.7:1
CoolingsystemAir
Displacement494.00 ccm (30.14 cubic inches)
EnginedetailsTwo cylinder boxer, four-stroke
FuelsystemCarburettor. Amal
Gearbox4-speed
IgnitionBattery
LubricationsystemWet sump
Power24.07 HP (17.6 kW)) @ 5600 RPM
Topspeed140.0 km/h (87.0 mph)
TransmissiontypefinaldriveShaft drive (cardan)

Other Specifications

StarterKick

Physical Measures & Capacities

Fuelcapacity14.00 litres (3.70 gallons)
Overallheight960 mm (37.8 inches)
Overalllength2,130 mm (83.9 inches)
Overallwidth815 mm (32.1 inches)
Weightincloilgasetc182.0 kg (401.2 pounds)

About BMW R51 1939

Introducing the 1939 BMW R51: A Timeless Classic on Two Wheels

The 1939 BMW R51 stands as a testament to the brand's commitment to engineering excellence and innovative design during a pivotal era in motorcycle history. Positioned in the allround category, the R51 was crafted for riders seeking a balance of performance, reliability, and comfort. This model represents a significant leap forward for BMW, showcasing their mastery of the iconic boxer engine layout and establishing a legacy that enthusiasts still cherish today. With its elegant lines and robust design, the R51 remains a sought-after classic, appealing to collectors and riders who appreciate the rich heritage of German engineering.

At the heart of the R51 lies a sophisticated two-cylinder boxer engine, displacing 494cc and delivering a robust 24.07 horsepower at 5600 RPM. This four-stroke powerhouse is configured with a 6.7:1 compression ratio, allowing for spirited acceleration and a top speed of 140 km/h (87 mph). Riders will appreciate the smooth power delivery and the distinctive thrum of the boxer engine, which provides a unique riding experience that’s both engaging and memorable. The R51's 4-speed gearbox and shaft drive contribute to its effortless handling, making it a superb choice for both leisurely rides and spirited outings.

The R51 is not just about power; it incorporates features that elevate the riding experience. Its steel single-cradle frame ensures durability while maintaining a lightweight feel, complemented by a sophisticated cartridge front suspension and a twin-shock swingarm at the rear. Stopping power is delivered through dual 200 mm drum brakes, providing reliable performance even in challenging conditions. With a fuel capacity of 14 liters, riders can embark on longer journeys with confidence, knowing they have the range to explore the open road. The classic kick starter adds to the nostalgic charm, reflecting the era's simplicity and mechanical beauty.

Pros and Cons of the 1939 BMW R51

Pros:

  1. Iconic Boxer Engine: The unique two-cylinder boxer design offers a distinctive riding experience with a low center of gravity and smooth power delivery.
  2. Timeless Aesthetics: The elegant styling and classic lines make the R51 a true head-turner, appealing to vintage motorcycle enthusiasts and collectors alike.
  3. Comfortable Ride: The combination of robust suspension and ergonomic design ensures a comfortable ride for both the rider and passenger, making it ideal for longer journeys.

Cons:

  1. Limited Modern Features: As a classic motorcycle, it lacks some modern conveniences such as electric start and advanced braking technologies.
  2. Maintenance Requirements: The vintage design may require more frequent maintenance and care, especially for parts that are no longer in production.
  3. Performance Compared to Modern Bikes: While remarkable for its time, the R51’s performance may feel less powerful compared to contemporary motorcycles, which can dissuade some riders seeking high-performance capabilities.

In summary, the 1939 BMW R51 is a captivating blend of history, design, and engineering. It invites riders to experience the nostalgia of an era long past while delivering a riding experience that remains enjoyable today. Whether you're a seasoned collector or a motorcycle enthusiast seeking to explore the roots of motorcycling, the R51 offers an unforgettable journey through time.

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