| MODEL | ARIEL KH 500 FIELDMASTER 1957 |
| Year | 1957 |
| Engine Type | Twin, four-stroke, OHV |
| Displacement / Capacity | 498 cc / 30.39 cu in |
| Bore X Stroke | 56.0 x 86.0 mm / 2.2 x 3.4 in |
| Compression Ratio | 6.8:1 |
| Cooling System | Air |
| Max Power | 20.5 kW / 28 hp @ 6500 rpm |
| Max Torque | — |
| Ignition | Lucas |
| Induction | Carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 4-speed |
| Clutch | Dry plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Duplex loop |
| Front Suspension | Telescopic forks |
| Rear Suspension | Rigid |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 2184 mm / 86 in |
| Overall Width | 686 mm / 27 in |
| Overall Height | — |
| Seat Height | 787 mm / 31 in |
| Wheelbase | 1422 mm / 56 in |
| Ground Clearance | 140 mm / 5.5 in |
| Dry Weight | 177 kg / 390.2 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00-20 |
| Rear Tyre | 3.50-19 |
| FUEL SYSTEM | |
| Fuel Capacity | 17 Litres / 4.49 US gal |
| Fuel Consumption | 3.04 L/100 km / 77.4 mpg |
| Top Speed | 145 km/h / 90.1 mph |
The KH Fieldmaster is the 500 cc parallel twin in Ariel's rigid-frame range, a plain, sturdy all-round roadster with a sprung solo saddle and telescopic forks. It makes about 28 hp and was finished in red.
