It appears you're interested in specifications for the Harley-Davidson Sport Twin. This Sport model is powered by a Twin, four-stroke engine with 589.97 ccm (36.00 cubic inches) of actual displacement before 3.8:1 compression. Fueling is metered via Carburettor allowing this machine to produce its horsepower and torque. According to our records engine heat of the Harley-Davidson Sport Twin is moderated by Air. You'll need to get familiar with the transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 26-Mar and the rear is 26-Mar. The entire package is supported by the frame, Tubular 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 Harley-Davidson Sport Twin was launched in 1919, 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.