It appears you're interested in specifications for the NSU 4PS. This Sport model is powered by a Twin, four-stroke engine with 498.00 ccm (30.39 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor allowing this machine to produce its 6.50 HP (4.7 kW) horsepower and torque. According to our records engine heat of the NSU 4PS is moderated by . 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 2.5-26 and the rear is 2.5-26 . 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 front brakes and rear brakes. The NSU 4PS was launched in 1925, 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.