Triumph T120 Bonneville 1959 specs
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| Displacement | 649.00 ccm (39.60 cubic inches) |
| Engine Details | Twin, four-stroke |
| Power | 46.00 HP (33.6 kW)) @ 6700 RPM |
| Top Speed | 185.0 km/h (115.0 mph) |
| Bore X Stroke | 71.0 x 82.0 mm (2.8 x 3.2 inches) |
| Fuel System | Carburettor. Amal monobloc carburettor |
| Ignition | Lucas K2F auto-advance Magneto |
| Cooling System | Air |
| Gearbox | 4-speed |
| Transmission Type Final Drive | Chain |
| Clutch | Multi-plate, wet |
| Frame Type | Duplex frame |
| Front Brakes | Expanding brake (drum brake) |
| Front Brakes Diameter | 203 mm (8.0 inches) |
| Front Suspension | Telescopic fork. |
| Front Tyre | 3.25-18 |
| Rear Brakes | Expanding brake (drum brake) |
| Rear Brakes Diameter | 178 mm (7.0 inches) |
| Rear Suspension | Twin shocks. Girlings 100 lb/ft spring tension, adjustable pre-set. |
| Rear Tyre | 3.50-18 |
| Seat | Dual seat |
| Dry Weight | 178.0 kg (392.4 pounds) |
| Fuel Capacity | 15.14 litres (4.00 gallons) |
| Ground Clearance | 127 mm (5.0 inches) |
| Power Weight Ratio | 0.2584 HP/kg |
| Seat Height | 770 mm (30.3 inches) If adjustable, lowest setting. |
| Color Options | Pearl Grey/Azure Blue |
| Electrical | AC Alternator |
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