Bonneville

2009 Triumph Bonneville Technical Analysis & Specification Breakdown

At the heart of the 2009 Triumph Bonneville classic motorcycle, Triumph utilizes a 865 cc (52.8 cu in) air-cooled twin, four-stroke layout. In factory specification, peak output is rated at 67.1 HP (48.9 kW) at 7,500 rpm while maximum torque reaches 69 Nm (50.9 lb-ft) at 5,800 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 77.6 HP per liter and a 1,700 rpm working window between peak torque (5,800 rpm) and peak power (7,500 rpm), 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 measures 203 kg (448 lbs) dry, translating to a power-to-weight ratio of 0.33 HP/kg (3.03 kg per horsepower). Rider ergonomics and chassis geometry center around a 751 mm (29.6 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,500 mm (59.1 in) wheelbase engineered for balanced agility and highway composure. The 16-liter (4.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Within MotoLibrary's Triumph archive, this model family spans 19 indexed model years from 1986 to 2016, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.