It appears you're interested in specifications for the Can-Am DS 450 EFI X xc. This ATV model is powered by a Single cylinder, four-stroke engine with 449.30 ccm (27.42 cubic inches) of actual displacement before compression. Fueling is metered via Injection. 46-mm Throttle Body, 16 bit / 32-MHz CPU allowing this machine to produce its horsepower and torque. According to our records engine heat of the Can-Am DS 450 EFI X xc is moderated by Liquid. 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 21/7-10 and the rear is 20/10-9 . The entire package is supported by the frame, No weld, ALTEC twin pyramidal aluminum 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. Wilwood front brakes and Single disc. Wilwood rear brakes. The Can-Am DS 450 EFI X xc was launched in 2010, 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.