| MODEL | ARIEL 2.25 HP 1903 |
| Year | 1903 |
| Engine Type | Single cylinder, four-stroke, sidevalve |
| Displacement / Capacity | 249 cc / 15.19 cu in |
| Bore X Stroke | — |
| Compression Ratio | — |
| Cooling System | Air |
| Max Power | 1.6 kW / 2.3 hp |
| Max Torque | — |
| Ignition | Magneto |
| Induction | Carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | — |
| Final Drive | Belt |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | Expanding (drum) |
| 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 | — |
A sidevalve single of about 250 cc that continued the early belt-driven Ariel formula with magneto ignition. Output was modest, suited to the lightly built frames of the period.
