NSU 251 SS: history, specs, pictures

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NSU 251 SS
Production 1927 - 1929
single cylinder, four-stroke
Bore / Stroke 63.0mm x 80.0mm
Top Speed 62 mph (100 km/h)
Horsepower 9.79 HP (7.3 KW) @ 4400RPM
Fuel System carburetor
Transmission Gear box: 3-speed
Final Drive: chain
Brakes Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
Front Tire 2.50-26
Rear Tire 2.50-26
Wheelbase 52.36 inches (1330 mm)
Weight 242.51 pounds (110.0 Kg) (dry),
Fuel Capacity 2.05 Gallon (7.75 Liters)
Manuals Service Manual

The NSU 251 SS was a single cylinder, four-stroke standard produced by NSU between 1927 and 1929. It could reach a top speed of 62 mph (100 km/h). Claimed horsepower was 9.79 HP (7.3 KW) @ 4400 RPM.

Engine[edit | edit source]

The engine was a air cooled single cylinder, four-stroke. A 63.0mm bore x 80.0mm stroke result in a displacement of just 247.0 cubic centimeters.

Drive[edit | edit source]

The bike has a 3-speed transmission.

Chassis[edit | edit source]

It came with a 2.50-26 front tire and a 2.50-26 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The 251 SS was fitted with a 2.05 Gallon (7.75 Liters) fuel tank. The bike weighed just 242.51 pounds (110.0 Kg). The wheelbase was 52.36 inches (1330 mm) long.