It appears you're interested in specifications for the NSU 251 OSL WH. This Allround model is powered by a Single cylinder, four-stroke engine with 242.00 ccm (14.77 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor. Amal allowing this machine to produce its 10.50 HP (7.7 kW) horsepower and torque. According to our records engine heat of the NSU 251 OSL WH is moderated by Air. You'll need to get familiar with the transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is 19-Mar and the rear is 19-Mar. The entire package is supported by the frame, Steel. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Expanding brake (drum brake) front brakes and Expanding brake (drum brake) rear brakes. The NSU 251 OSL WH was launched in 1940, and we're happy to know (or assume) you've got one in your garage. To help you keep your ride in tip-top shape, consider purchasing an owner or service manual.