It appears you're interested in specifications for the Harley-Davidson Sportster XL Ironhead. This Sport model is powered by a V2, four-stroke engine with 883.00 ccm (53.88 cubic inches) of actual displacement before 7.0:1 compression. Fueling is metered via Carburettor allowing this machine to produce its 40.00 HP (29.2 kW) horsepower and torque. According to our records engine heat of the Harley-Davidson Sportster XL Ironhead is moderated by Air. You'll need to get familiar with the 4-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 3.25-19 and the rear is 3.25-19 . The entire package is supported by the frame, Steel single downtube. 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 Harley-Davidson Sportster XL Ironhead 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.