Comparison of AJS Model 20 500 1959 and Zündapp K 500 1938 [S]ave
| Attribute |  AJS Model 20 500 1959 × |  Zündapp K 500 1938 × |
|---|---|---|
| General | ||
| Production from (year) | 1959 | 1938 |
| Make | AJS | Zündapp |
| Model | AJS Model 20 500 | Zündapp K 500 |
| Category | Allround | Allround |
| Engine and transmission | ||
| Engine type | Twin, four-stroke | Two cylinder boxer, four-stroke |
| Fuel system | Carburettor | Carburettor. Bing 22mm |
| Displacement (cm³) | 498 | 498 |
| Power (kw) | 14.6 | 11.7 |
| Cooling system | Air | Air |
| Transmission type,final drive | Chain | Shaft drive (cardan) |
| Bore (mm) | 66 | 69 |
| Stroke (mm) | 72.8 | 66.6 |
| Gearbox | - | 4-speed |
| Ignition | Magneto | - |
| Clutch | Wet multiplate | - |
| Compression | 7.0:1 | - |
| Chassis | ||
| Front suspension | Telescopic | Telescopic |
| Rear suspension | Twin shock | Rigid |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Frame type | Single cradle | - |
| Front tyre | 3.25-19 | 3.50-19 |
| Rear tyre | 3.25-19 | 3.50-19 |
| Seat | - | Two single seats |
| Wheels | Spoked | Spoked |
| Other | ||
| Starter | - | Kick |
| Dimensions | ||
| Dry weight (kg) | 178 | 180 |
| Power/weight ratio | 0.082 | 0.065 |
| Performance | ||
| Top speed (km/h) | 137 | 105 |
| Fuel capacity (l) | 13.5 | - |
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