| Attribute | Value |
| General |
| Production from | 1953 year |
| Make | AJS |
| Model | AJS Model 20 500 |
| Category | Allround |
| Engine and transmission |
| Engine type | Twin, four-stroke |
| Valves per cylinder | Add |
| Fuel system | Carburettor |
| Engine details | Add |
| Displacement | 498 cm³ |
| Power | 14.6 kw |
| Max RPM | Add |
| Fuel consumption | Add |
| Cooling system | Air |
| Transmission type,final drive | Chain |
| Torque | Add |
| Bore | 66 mm |
| Stroke | 72.8 mm |
| Gearbox | 4-speed |
| Greenhouse gases | Add |
| Fuel control | Add |
| Emission details | Add |
| Driveline | Add |
| Ignition | Magneto |
| Clutch | Wet multiplate |
| Lubrication system | Add |
| Compression | 7.0:1 |
| Exhaust system | Add |
| Chassis |
| Front suspension | Telescopic |
| Rear suspension | Twin shock |
| Front brakes | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) |
| Diameter | Add |
| Frame type | Single cradle |
| Front tyre | 3.25-19 |
| Rear tyre | 3.25-19 |
| Seat | Dual |
| Wheels | Spoked |
| Front wheel travel | Add |
| Rear wheel travel | Add |
| Trail | Add |
| Rake (fork angle) | Add |
| Other |
| Battery capacity | Add |
| Starter | Kick |
| Color options | Add |
| Carrying capacity | Add |
| Light | Add |
| Instruments | Add |
| Electrical Voltage | Add |
| Dimensions |
| Wheelbase | Add |
| Kerb weight | Add |
| Dry weight | 178 kg |
| Power/weight ratio | 0.082 |
| Overall height | 1,050 mm |
| Overall length | 2,190 mm |
| Overall width | 710 mm |
| Seat height | Add |
| Alternate seat height | Add |
| Ground clearance | Add |
| Front percentage of weight | Add |
| Rear percentage of weight | Add |
| Performance |
| Top speed | 137 km/h |
| Acceleration 0-100 km/h | Add |
| Length | Add |
| Reserve fuel capacity | Add |
| Fuel capacity | 13.5 l |
| Oil capacity | Add |
| Width | Add |
| Height | Add |