✦ Published
BMW R 51
1940
1940
The 1940 BMW R 51 represents a significant chapter in BMW Motorrad's pre-war history, building upon the successful R 5 and R 6 models. Introduced as a sportier, more powerful option, it continued BMW's tradition of shaft-driven, boxer-engined motorcycles. In its era, the R 51 faced direct competition from other high-performance European machines, such as the Norton 500T and the Matchless G80, all vying for supremacy in a rapidly evolving motorcycle market.
At the heart of the R 51 lay a robust two-cylinder boxer, four-stroke engine, displacing a precise 494.0 ccm (30.14 cubic inches). This powerplant was capable of generating 24.1 HP (17.6 kW) at 5600 RPM, a considerable output for the time. This allowed the R 51 to achieve an impressive top speed of 140.0 km/h (87.0 mph), making it one of the faster motorcycles available. Fuel capacity was a practical 14.00 litres (3.70 US gallons), offering a decent range for touring and extended rides.
Riding characteristics of the R 51 were defined by its rigid frame and plunger rear suspension, a significant improvement over earlier rigid-frame designs. The tele-fork front suspension, a BMW innovation, provided a relatively smooth ride for the period. Riders appreciated the R 51's stable handling, making it suitable for both spirited riding and long-distance travel. The upright riding position, typical of motorcycles of this era, offered good visibility and comfort, even if modern standards of ergonomics differ significantly.
The BMW R 51 was primarily aimed at enthusiasts seeking a high-performance, reliable, and well-engineered motorcycle for sport and touring. Its robust construction and impressive speed appealed to those who valued quality and capability. Today, the R 51 is a highly sought-after classic, cherished by collectors and historical motorcycle aficionados who appreciate its engineering legacy and its role in shaping BMW's reputation for crafting superior machines.
✅ Why buy this bike?
• Iconic pre-war BMW design, highly sought after by collectors for its historical significance and classic aesthetics. • Robust flat-twin engine known for its reliability and smooth power delivery, even by modern standards for vintage bikes. • Shaft drive system offers low maintenance and clean operation compared to chain-driven motorcycles of the era. • Excellent build quality and engineering, a testament to BMW's reputation for durability and longevity. • Comfortable riding position and effective suspension for its time, making longer journeys more enjoyable than many contemporaries.⚠️ Things to consider
• Limited availability of original spare parts, making repairs and restorations challenging and expensive. • Relatively low power output (24 hp) by today's standards, limiting its performance on modern roads. • Drum brakes offer significantly less stopping power compared to modern disc brakes, requiring careful anticipation. • Lack of modern safety features like ABS or traction control, demanding a skilled and cautious rider. • High acquisition cost and ongoing maintenance expenses due to its vintage status and scarcity.The BMW R 51 produces 24 HP, fitting A2 license limits (max 35 kW / 47 HP). For riders 18+.
Estimated average for 494cc class: 45-60 mpg (4.0-5.5 L/100km)
⛽ Tank: 14.00 litres (3.70 US gallons)
Insurance grouping for BMW R 51 (494cc):
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