Bonneville USA

1985 Triumph Bonneville USA Technical Analysis & Specification Breakdown

At the heart of the 1985 Triumph Bonneville USA sport touring motorcycle, Triumph pairs a 744 cc (45.4 cu in) air-cooled twin, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 49 HP (35.8 kW) at 6,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 65.9 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 Bonneville USA measures 192 kg (423 lbs) wet (curb), translating to a power-to-weight ratio of 0.26 HP/kg (3.92 kg per horsepower). The 11-liter (2.9 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 161 km/h (100 mph).

Within MotoLibrary's Triumph archive, this model family spans 2 indexed model years from 1984 to 1985, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.