It appears you're interested in specifications for the BMW R2 Series 4. This Allround model is powered by a Single cylinder, four-stroke engine with 198.00 ccm (12.08 cubic inches) of actual displacement before 6.7:1 compression. Fueling is metered via Carburettor. Amal 18mm allowing this machine to produce its 8.02 HP (5.9 kW) horsepower and torque. According to our records engine heat of the BMW R2 Series 4 is moderated by Air. You'll need to get familiar with the 3-speed transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 2.99-25.00 and the rear is 2.99-25.00 . The entire package is supported by the frame, Pressed steel duplex. 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 BMW R2 Series 4 was launched in 1935, 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.