Comparison of AJS Model 20 500 1957 and Sunbeam S7 500 1956 [S]ave
| Attribute |  AJS Model 20 500 1957 × |  Sunbeam S7 500 1956 × |
|---|---|---|
| General | ||
| Production from (year) | 1957 | 1956 |
| Make | AJS | Sunbeam |
| Model | AJS Model 20 500 | Sunbeam S7 500 |
| Category | Allround | Sport touring |
| Engine and transmission | ||
| Engine type | Twin, four-stroke | Twin, four-stroke |
| Fuel system | Carburettor | Carburettor |
| Displacement (cm³) | 498 | 487 |
| Power (kw) | 14.6 | 17.5 |
| Cooling system | Air | Oil & air |
| Transmission type,final drive | Chain | Shaft drive (cardan) |
| Bore (mm) | 66 | 70 |
| Stroke (mm) | 72.8 | 63.5 |
| Fuel control | - | Overhead Cams (OHC) |
| Ignition | Magneto | - |
| Clutch | Wet multiplate | Dry singleplate |
| Lubrication system | - | Wet sump |
| Compression | 7.0:1 | 6.5:1 |
| Chassis | ||
| Front suspension | Telescopic | Telescopic |
| Rear suspension | Twin shock | Plungers |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Frame type | Single cradle | Twin cradle |
| Front tyre | 3.25-19 | 4.50-16 |
| Rear tyre | 3.25-19 | 4.50-16 |
| Seat | Dual | Single |
| Wheels | Spoked | Spoked |
| Other | ||
| Starter | Kick | Kick |
| Color options | - |
|
| Dimensions | ||
| Dry weight (kg) | 178 | 194 |
| Power/weight ratio | 0.082 | 0.0902 |
| Performance | ||
| Top speed (km/h) | 137 | 121 |
| Fuel capacity (l) | 13.5 | - |
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