It appears you're interested in specifications for the ATK 450 XC. This Enduro / offroad model is powered by a Single cylinder, four-stroke engine with 446.00 ccm (27.21 cubic inches) of actual displacement before 12.3:1 compression. Fueling is metered via Injection. EFI Fuel Injection allowing this machine to produce its 46.00 HP (33.6 kW) horsepower and torque. According to our records engine heat of the ATK 450 XC is moderated by . You'll need to get familiar with the 5-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 80/100-21 and the rear is 110/100-18 . The entire package is supported by the frame, Aluminum Twin-Spar. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc. Dual piston, front brakes and Single disc. Dual piston, rear brakes. The ATK 450 XC was launched in 2007, 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.