| MODEL | VESPA 125 GTR 1968 - 78 |
| Year | 1968 - 78 |
| Engine Type | Two stroke, single cylinder |
| Displacement / Capacity | 123.4 cc / 7.5 cu in |
| Bore X Stroke | 52.5 x 57 mm |
| Compression Ratio | 7.3:1 |
| Cooling System | Air cooled, centrifugal fan |
| Max Power | 4.6 kW / 6.3 hp @ 5000 rpm |
| Max Torque | — |
| Ignition | Contact breaker and coil |
| Induction | Disc valve, Dell'Orto SHB 16/16 carburettor |
| Start System | Kick start |
| TRANSMISSION SPECS | |
| Lubrication | Premix 1:50 |
| Gear Box | 4 speed, grip-shift, constant mesh |
| Clutch | Wet, multiplate |
| Final Drive | Direct drive |
| CHASSIS SPECS | |
| Frame | Pressed sheet steel, streamlined monocoque |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 1795 mm / 70.7 in |
| Overall Width | 710 mm / 28.0 in |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1220 mm / 48.0 in |
| Ground Clearance | — |
| Dry Weight | 90 kg / 198 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.5 x 10 in |
| Rear Tyre | 3.5 x 10 in |
| FUEL SYSTEM | |
| Fuel Capacity | 7.7 Litres / 2.0 US gal |
| Fuel Consumption | 2 L/100 km / 117 US mpg |
| Top Speed | 92 km/h / 57 mph |
The GTR was the sporty 125 of the Vespa small-frame line from 1968, a quicker sibling of the 125 GT/Sprint with a disc-valve engine and larger 10-inch wheels. It carried the usual pressed-steel monocoque with grip-shift four-speed gearbox and drum brakes. Production was around 45,000 units according to the source.
