AJS Model 20 500 (1948-61) vs AJS Model 30 600 (1956) vs AJS R7 Track Racer (1930) vs AJS EOS 125 Mk2 (2012-14)
Comparison technical specifications
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| Make: | AJS | AJS | AJS | AJS |
| Model: | Model 20 500 | Model 30 600 | R7 Track Racer | EOS 125 Mk2 |
| Years: | 1948-61 | 1956 | 1930 | 2012-14 |
| Engine: | Four stroke, parallel twin cylinder, OHV. 2 valve per cylinder, Crankshaft: 3-saved plain bearing / roller bearing | Four stroke, pushrod parallel twin, OHV, 2 valves per cylinder, | Single cylinder, OHC | Twin cylinder, 4-stroke |
| Capacity: | 498 cc / 30.4 cu in | 593 cc / 36.2 cu in | 350 cc / 21.4 cub in | 124 cc / 7.6 cub in |
| Cooling System: | Air cooled | Air cooled | Air cooled | Liquid cooled |
| Transmission: | 4 Speed | 4 Speed | Close ratio gearbox | 5-Speed |
| Front Suspension: | Hydraulic telescopic fork | Hydraulic telescopic fork | Girder fork | Telescopic forks, USD |
| Rear Suspension: | Dual chocks | Dual chocks | Ridged, spring loaded saddle | Twin shock |