Introducing the 1937 NSU 251 OSL, a classic that embodies the spirit of pre-war sport motorcycles. As NSU’s foray into the burgeoning sportbike market, the 251 OSL stands as a testament to the innovation and craftsmanship of its era. With its sleek lines and robust engineering, this motorcycle appeals to both collectors and riding enthusiasts alike. Its combination of lightweight construction and spirited performance positions it as a prime choice for those who appreciate the blend of heritage and thrilling rideability.
At the heart of the NSU 251 OSL is a single-cylinder, four-stroke engine that displaces 242 cc, producing a respectable 10.5 horsepower at 5200 RPM. This powerplant, coupled with a 4-speed gearbox, allows the motorcycle to achieve a top speed of 100 km/h (62.1 mph)—a satisfying pace for a bike of its time. Riders will appreciate the engine's smooth operation, aided by its air-cooled design and reliable battery ignition system from Bosch. The bike's efficient fuel consumption of just 2.30 litres per 100 km (or an impressive 102.27 mpg) ensures that every ride can be enjoyed without the constant worry of refueling.
The NSU 251 OSL is not just about power; it boasts a well-thought-out chassis and suspension that enhance both comfort and handling. The open double steel frame provides stability while keeping the weight down to a nimble 126 kg (277.8 lbs). The expanding drum brakes at both the front and rear offer reliable stopping power, allowing riders to tackle corners and straights with confidence. With a compact overall length of 2000 mm and a width of 760 mm, the motorcycle feels agile in urban environments yet stable on longer rides. Additionally, the kick starter adds a touch of vintage charm, ensuring that the connection between rider and machine is as intimate as it is exhilarating.
Pros:
- Fuel Efficiency: With a remarkable consumption of just 2.30 litres per 100 km, the 251 OSL allows for extended rides without constant stops for fuel.
- Agile Handling: The lightweight design and open double steel frame contribute to agile maneuverability, making it perfect for both city and country roads.
- Classic Charm: Its vintage aesthetics and classic engineering appeal to collectors and enthusiasts who cherish motorcycle history.
Cons:
- Limited Power Output: With only 10.5 HP, the performance may feel modest compared to modern sport bikes, limiting its appeal for those seeking high-speed thrills.
- Drum Brakes: While effective for its time, the expanding drum brakes may not provide the stopping power and responsiveness found in contemporary disc brake systems.
- Kick Start Only: The absence of an electric start may be a drawback for some riders, especially in urban scenarios where quick restarts are often required.
In summary, the 1937 NSU 251 OSL is a compelling choice for anyone passionate about classic motorcycles. Its combination of efficient performance, engaging handling, and rich history makes it a standout in the sport category from the pre-war era.
