It appears you're interested in specifications for the Simson 425 GS. This Sport model is powered by a Single cylinder, four-stroke engine with 247.00 ccm (15.07 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor allowing this machine to produce its 17.50 HP (12.8 kW) horsepower and torque. According to our records engine heat of the Simson 425 GS is moderated by Air. You'll need to get familiar with the transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 3.5-19 and the rear is 18-Apr. The entire package is supported by the frame, . 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 Simson 425 GS was launched in 1957, 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.