T120 R Bonneville

1962 Triumph T120 R Bonneville Technical Analysis & Specification Breakdown

Built around Triumph's sport motorcycle platform, the 1962 Triumph T120 R Bonneville features a 649 cc (39.6 cu in) air-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 46 HP (33.6 kW) at 6,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 70.9 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the T120 R Bonneville measures 178 kg (392 lbs) dry, translating to a power-to-weight ratio of 0.26 HP/kg (3.87 kg per horsepower). Rider ergonomics and chassis geometry center around a 770 mm (30.3 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,400 mm (55.1 in) wheelbase engineered for quick, flickable steering geometry. The 15.14-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 185 km/h (115 mph).

Within MotoLibrary's Triumph archive, this model family spans 3 indexed model years from 1960 to 1962, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.