NSU 251 OSL 1934 - Specifications & Review

The 1934 NSU 251 OSL: A Sporty Classic

Introducing the 1934 NSU 251 OSL, a motorcycle that embodies the spirit of early 20th-century sport biking with an engaging mix of style, power, and engineering prowess. Positioned as a sport category bike, the 251 OSL was designed for enthusiasts who craved both performance and an exhilarating riding experience. With its sleek lines and classic aesthetics, this motorcycle not only turned heads but also carved a niche in the burgeoning motorcycle market of its time, appealing to riders seeking the thrill of speed and the elegance of vintage design.

At the heart of the 251 OSL lies a single-cylinder, four-stroke engine with a displacement of 242 cc, producing 9 horsepower at a lively 5000 RPM. This power translates into a top speed of 100 km/h (62.1 mph), making it a spirited performer on both open roads and winding tracks. The engine’s bore and stroke measurements of 64.0 x 75.0 mm ensure a balanced power delivery that is both responsive and enjoyable. Coupled with a 4-speed gearbox and chain final drive, riders can seamlessly shift through the gears while enjoying an impressive fuel efficiency of 2.30 liters per 100 km (around 102.27 mpg), allowing for longer rides without frequent stops at the pump.

The NSU 251 OSL boasts a robust open double steel frame that not only enhances its strength but also contributes to a lightweight design, tipping the scales at just 126 kg (277.8 pounds). The motorcycle is equipped with drum brakes at both the front and rear, offering reliable stopping power, while the air-cooled engine ensures that the heart of the beast runs smoothly even during spirited rides. Key features such as the kickstarter and a fuel capacity of 11.5 liters add to the bike's practicality, making it a well-rounded choice for both everyday use and spirited excursions.

PROs:

1. Impressive Fuel Efficiency: With a consumption rate of 2.30 liters/100 km, the NSU 251 OSL allows for long rides without frequent fuel stops, ideal for touring enthusiasts.
2. Classic Aesthetic: Its vintage design and quality craftsmanship make it a standout piece for collectors and motorcycle aficionados alike.
3. Lightweight Design: The low weight enhances maneuverability and handling, making it an agile performer on various terrains.

CONs:

1. Limited Power Output: With only 9 HP, it may not satisfy riders looking for more aggressive performance or acceleration.
2. Drum Brakes: While functional, the drum brakes may not provide the same level of stopping power as modern disc brakes, especially in emergency situations.
3. Kickstarter Only: The absence of an electric starter can be a drawback for riders accustomed to the convenience of modern motorcycles.

The 1934 NSU 251 OSL is not just a motorcycle; it’s a piece of history that invites riders to experience the past while enjoying the thrill of the open road. Whether you’re a seasoned vintage bike enthusiast or a newcomer to the classic motorcycle scene, the NSU 251 OSL offers a unique blend of charm, performance, and nostalgia.