Motorcycle Directory

The Triumph Bonneville T120 650cc, introduced in 1960, is one of the most iconic motorcycles of its era. Renowned for its performance, style, and engineering, the Bonneville T120 has left a significant mark on motorcycle history. Here’s a comprehensive look at its specifications, manufacturer design, legacy, and interesting facts:

Specifications

• Engine: The Bonneville T120 is powered by a 649 cc, air-cooled, parallel-twin engine.
• Bore x Stroke: The bore is 71.1 mm and the stroke is 91.1 mm.
• Compression Ratio: The engine has a compression ratio of 8.5:1.
• Power Output: It produces around 46 horsepower at 6,500 rpm.
• Transmission: It features a 4-speed gearbox.
• Suspension:
• Front: Telescopic forks.
• Rear: Swingarm with twin shock absorbers.
• Brakes:
• Front: Drum brake.
• Rear: Drum brake.
• Fuel Tank Capacity: Approximately 11.5 litres (3.0 gallons).
• Dry Weight: Around 190 kg (420 lbs).

Manufacturer Design

• Design Philosophy: Triumph’s design for the Bonneville T120 focused on blending performance with style. The motorcycle was engineered to be both fast and reliable, with a distinct look that became emblematic of the era.
• Frame and Build: The T120 featured a robust duplex cradle frame, providing stability and strength. The design was aimed at balancing performance with a comfortable ride.
• Aerodynamics: The bike’s design was more about classic lines and aesthetic appeal than aerodynamic efficiency, which was a hallmark of 1960s motorcycles.

Legacy

• Impact on Triumph: The Bonneville T120 was pivotal in establishing Triumph as a leading motorcycle manufacturer. Its success helped solidify Triumph’s reputation for high-performance, stylish motorcycles.
• Influence on Motorcycles: The Bonneville T120 set a standard for performance and design that influenced many subsequent models and manufacturers. Its engine and styling elements have been referenced and emulated in various other motorcycles.
• Cultural Impact: The Bonneville T120 became a symbol of British motorcycling and was closely associated with the rock ‘n’ roll culture of the 1960s. It was popular among celebrities and became an icon of the era.

Interesting Facts

• Naming: The T120 was named after the Bonneville Salt Flats in Utah, USA, where Triumph had set speed records. This name was intended to evoke a sense of speed and performance.
• Racing Success: The Bonneville T120 enjoyed considerable success in racing, particularly in the 1960s, where it was known for its speed and reliability. It was a popular choice for endurance racing and speed trials.
• Design Continuity: The T120’s design and engineering principles continued to influence Triumph’s motorcycle designs for decades. The Bonneville name has remained synonymous with the brand’s performance and style.
• Pop Culture: The Bonneville T120 has appeared in numerous films and television shows, further cementing its place in popular culture. It was famously ridden by Steve McQueen in the movie “The Great Escape.”

Overall, the Triumph Bonneville T120 650cc from 1960 is celebrated for its blend of performance, style, and cultural significance. Its innovative engineering, combined with its iconic design, has made it a lasting symbol of classic British motorcycling.