It appears you're interested in specifications for the NSU 3 1-2 PS. This Sport model is powered by a Single cylinder, four-stroke engine with 499.00 ccm (30.45 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor allowing this machine to produce its 5.50 HP (4.0 kW) horsepower and torque. According to our records engine heat of the NSU 3 1-2 PS is moderated by Air. You'll need to get familiar with the transmission and pay attention to final drive Belt maintainence. Our best information shows that the front tire size is 2.25-26 and the rear is 2.25-26 . The entire package is supported by the frame, Steel tube. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on front brakes and rear brakes. The NSU 3 1-2 PS was launched in 1906, 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.