It appears you're interested in specifications for the Derbi GPR Racing 125. This Sport model is powered by a Single cylinder, two-stroke engine with 124.76 ccm (7.61 cubic inches) of actual displacement before 12.5:1 compression. Fueling is metered via Carburettor. Mikuni 28 mm allowing this machine to produce its horsepower and torque. According to our records engine heat of the Derbi GPR Racing 125 is moderated by Liquid. You'll need to get familiar with the 6-speed transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is 110/80-17 and the rear is 140/70-17 . 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. 2-piston calipers front brakes and Single disc. 2-piston calipers rear brakes. The Derbi GPR Racing 125 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.