| MODEL | MONDIAL 125 BIALBERO GP 1951 |
| Year | 1951 |
| Engine Type | Single-cylinder, four-stroke, double overhead camshaft (bialbero), gear-driven camshafts |
| Displacement / Capacity | 125 cc |
| Bore X Stroke | — |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | — |
| Max Torque | — |
| Ignition | Magneto |
| Induction | — |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4-speed, unit construction with engine |
| Clutch | — |
| Final Drive | Chain (gear primary drive) |
| CHASSIS SPECS | |
| Frame | Tubular duplex cradle with single top tube |
| Front Suspension | Girder forks with a single compression spring |
| Rear Suspension | Plunger |
| Front Brakes | — |
| Rear Brakes | — |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
The 1951 works 125 replaced the earlier shaft-driven overhead cam layout with twin overhead camshafts driven by a gear train, in a deeply finned single cylinder bolted to a unit-construction gearbox. A fully enclosed racer with girder forks and plunger rear suspension, it was considered ahead of its rivals in 1951, the year Carlo Ubbiali took the 125 world title for Mondial.
