It appears you're interested in specifications for the Harley-Davidson FLSTFB Fat Boy Special. This Custom / cruiser model is powered by a Twin Cam 103B™ V2, four-stroke engine with 1690.00 ccm (103.12 cubic inches) of actual displacement before 9.6:1 compression. Fueling is metered via Injection. Electronic Sequential Port Fuel Injection (ESPFI) allowing this machine to produce its horsepower and torque. According to our records engine heat of the Harley-Davidson FLSTFB Fat Boy Special is moderated by Air. You'll need to get familiar with the 6-speed transmission and pay attention to final drive Belt maintainence. Our best information shows that the front tire size is 140/75-R17 and the rear is 200/55-R17 . 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 Double disc front brakes and Single disc rear brakes. The Harley-Davidson FLSTFB Fat Boy Special was launched in 2012, 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.