NSU 251 OSL 1940 - Specifications & Review

The 1940 NSU 251 OSL: A Classic Sport Motorcycle

The 1940 NSU 251 OSL stands as a testament to the innovative spirit of pre-war motorcycle engineering. Positioned in the sport category, this classic machine combines elegance with performance, appealing to both enthusiasts and collectors alike. With a design that reflects the era's aesthetic sensibilities, the NSU 251 OSL was crafted for those who sought adventure and speed, making it a noteworthy contender in the competitive motorcycle market of its time.

At the heart of the NSU 251 OSL lies a robust single-cylinder, four-stroke engine with a displacement of 242 ccm. Delivering an impressive 10.50 horsepower at 5200 RPM, this motorcycle is capable of reaching a top speed of 100 km/h (62.1 mph). Its bore and stroke measurements of 64.0 x 75.0 mm provide a balanced power delivery, making it responsive on the open road. The air-cooled engine, paired with a 4-speed gearbox and chain final drive, ensures a smooth and spirited ride, whether navigating through city streets or cruising along winding country roads. The nostalgic feel of riding this vintage bike is further enhanced by its reliable battery ignition system, offering the rider a sense of connection to the rich history of motorcycling.

The NSU 251 OSL showcases several key features that highlight its engineering prowess. The open double steel frame not only contributes to the bike's lightweight design—tipping the scales at just 126 kg (277.8 pounds)—but also provides a solid foundation for stability and control. The drum brakes, both at the front and rear, offer dependable stopping power, allowing riders to confidently tackle a variety of road conditions. The dimensions of the bike, measuring 2000 mm in length, 760 mm in width, and 1000 mm in height, create an approachable ergonomics that suits riders of different sizes. This blend of performance and comfort makes the NSU 251 OSL an enjoyable ride for both seasoned bikers and those new to the sport.

Pros:

1. Classic design with historical significance, appealing to collectors and vintage enthusiasts.
2. Lightweight construction enhances agility and maneuverability on the road.
3. Reliable engine performance with a smooth power delivery, perfect for leisurely rides or spirited outings.

Cons:

1. Limited power output may not satisfy riders seeking high-performance capabilities.
2. Drum brakes, while effective for their time, may lack the stopping power and responsiveness of modern disc brakes.
3. Parts availability can be challenging, making maintenance and restoration difficult for owners.

The 1940 NSU 251 OSL is more than just a motorcycle; it's a piece of history that delivers a unique riding experience. With its charming blend of style, performance, and engineering ingenuity, it continues to capture the imagination of motorcycle lovers around the world.