| MODEL | GASGAS 125 PRO 2005 |
| Year | 2005 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 124.8 cc / 7.62 cu in |
| Bore X Stroke | 54.0 x 54.5 mm / 2.1 x 2.1 in |
| Compression Ratio | — |
| Cooling System | Liquid |
| Max Power | — |
| Max Torque | — |
| Ignition | Kokusan digital CDI, electric flywheel magneto |
| Induction | Carburettor, Dell'Orto PHBL 26BS |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | Hydraulic, 2 steel, 3 fibre discs |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Deltabox, chromoly tubing |
| Front Suspension | Marzocchi 38 mm conventional telescopic forks |
| Rear Suspension | Progressive linkage system |
| Front Brakes | Single disc, 4-piston AJP caliper |
| Rear Brakes | Single disc, 2-piston AJP caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 635 mm / 25.0 in |
| Wheelbase | 1320 mm / 52.0 in |
| Ground Clearance | 345 mm / 13.6 in |
| Dry Weight | 63.0 kg / 139.0 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 2.75-21 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 2.9 Litres / 0.77 US gal |
| Fuel Consumption | — |
| Top Speed | — |
Entry-level model of the 2005 Pro trials range, a liquid-cooled two-stroke with a Deltabox chromoly frame. It is the lightest of the four Pro capacities and uses AJP brakes and a Marzocchi fork.
