It appears you're interested in specifications for the Polaris Sportsman 550 Touring EPS. This ATV model is powered by a Single cylinder, four-stroke engine with 549.00 ccm (33.50 cubic inches) of actual displacement before compression. Fueling is metered via Injection allowing this machine to produce its horsepower and torque. According to our records engine heat of the Polaris Sportsman 550 Touring EPS is moderated by Liquid. You'll need to get familiar with the Automatic transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 26/8-14 and the rear is 26/10-14 . 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 Single disc front brakes and Expanding brake (drum brake) rear brakes. The Polaris Sportsman 550 Touring EPS was launched in 2011, 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.