It appears you're interested in specifications for the Cobra CX50 Jr. This Minibike, cross model is powered by a Single cylinder, four-stroke engine with 50.00 ccm (3.05 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor allowing this machine to produce its horsepower and torque. According to our records engine heat of the Cobra CX50 Jr is moderated by Liquid. You'll need to get familiar with the Automatic transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 2.50-12 and the rear is 2.75-10 . The entire package is supported by the frame, Double Cradle 4130 ChrMo Steel. 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 Cobra CX50 Jr was launched in 2009, 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.