| MODEL | DERBI GPR 125 2005 - 2006 |
| Year | 2005 - 2006 |
| Engine Type | Two-stroke, single cylinder |
| Displacement / Capacity | 124.7 cc / 7.6 cu in |
| Bore X Stroke | 56 x 50 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 11 kW / 15 hp @ 8250 rpm |
| Max Torque | 13.5 Nm |
| Ignition | Electronic CDI |
| Induction | 28 mm Mikuni carburettor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 40 mm USD hydraulic fork, 120 mm wheel travel |
| Rear Suspension | Monoshock, 110 mm wheel travel |
| Front Brakes | Single 300 mm disc, 4-piston caliper |
| Rear Brakes | Single 180 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 123 kg / 271 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 |
| Rear Tyre | 140/70-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 13 Litres / 3.4 US gal |
| Fuel Consumption | — |
| Top Speed | 134 km/h |
The GPR 125 Racing was Derbi's fully faired road-going replica of its Grand Prix machines, powered by a liquid-cooled 125 cc two-stroke. It had a six-speed gearbox, upside-down fork and a 300 mm four-piston front brake. It was a quick, light learner-legal sports bike with a claimed top speed around 134 km/h.
