| Manufacturer | Derbi |
|---|---|
| Also called | Gilera SC125 |
| Parent company | Piaggio |
| Production | 2005– |
| Class | Sport bike |
| Engine | 125 cc (7.6 cu in) 2005-2009: liquid cooled, two stroke[1] 2010-: liquid cooled four stroke[2] |
| Bore / stroke | 2005-2009: 56.0 mm × 50.7 mm (2.20 in × 2.00 in) 2010-: 58.0 mm × 47.0 mm (2.28 in × 1.85 in) |
| Transmission | 6-speed |
| Suspension | Ø40 mm upside-down fork. 110 mm. travel Rear: Monoshock. 110 mm travel, Adjustable Preload |
| Brakes | Front: Single 300 mm Hydraulic Disc with Four Piston Radial Caliper Rear: Single 180 mm Disc with Two-Piston Caliper |
| Tires | Front: 110/70-17 Rear: 140/70-17 |
| Wheelbase | 53.34 in (1,355 mm) |
| Dimensions | L: 79.68 in (2,024 mm) W: 28.34 in (720 mm) H: 45.66 in (1,160 mm) |
| Weight | 225 lb (102 kg) (dry) 285 lb (129 kg) (wet) |
| Fuel capacity | 3.4 US gallons (13 L; 2.8 imp gal) |
| Related | Derbi GPR 125 Nude, Derbi GPR 50 Racing & Nude, Gilera SC 125 & Moto 125sc |
The Derbi GPR 125 is a street motorcycle sold by Derbi - Nacional Motor since 2005.[2] The original GPR125 was powered by a single-cylinder two-stroke engine with a steel lined cast iron cylinder manufactured by Yamaha, but was superseded in 2010 by an all-new DOHC four-stroke four-valve model.[3]
The engine in the original two-stroke model is sourced from Yamaha. This engine was used in the Yamaha DTR125 Dual Sport and TZR125 sport bike. Engine parts from these two bikes will directly swap with the Derbi. It uses the Yamaha Yamaha Power Valve System, a two-stroke power valve system, which consists of a rotary valve located in the exhaust port which changes the exhaust port timing and area. The power valve is controlled by an ECU and servo motor.
In 2010 the engine was changed to a new four-stroke engine.[3] The single cylinder engine features double overhead camshafts and four valves.[4]