It appears you're interested in specifications for the Derbi GPR 125 Nude. This Naked bike model is powered by a Single cylinder, two-stroke engine with 124.70 ccm (7.61 cubic inches) of actual displacement before 10.5:1 compression. Fueling is metered via Carburettor. Mikuni carburetor 28 mm allowing this machine to produce its horsepower and torque. According to our records engine heat of the Derbi GPR 125 Nude is moderated by Liquid. You'll need to get familiar with the 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, Double beam aluminum. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc. Radial clamp four pistons front brakes and Single disc. Clamp two pistons rear brakes. The Derbi GPR 125 Nude 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.