Triumph T 120 Bonneville II classic bikes for sale

History of the Triumph T 120 Bonneville II

The Triumph T 120 Bonneville II first hit the market in 1959, marking a significant chapter in British motorcycle engineering. Developed at a time when performance and style became ever more crucial for motorcycle buyers, the Bonneville quickly gained recognition worldwide. Named after the Bonneville Salt Flats, where Triumph set speed records, the T 120 built its reputation with strong road presence and agile handling. British craftsmanship and a link to motorsport, including paintwork inspired by the Tourist Trophy (TT) races, shaped the model’s character through the 1970s.

Model History

After its introduction in 1959, the T 120 Bonneville set itself apart with an increasingly powerful 650cc engine and improvements in chassis and braking over the years. The successor to Triumph’s pre-unit twins, the Bonneville was continuously optimised into the 1970s, notably with upgrades such as electronic ignition and duplex (twin leading shoe) front brakes. The model evolved with demand while preserving its essential parallel-twin configuration and English roots. Later Bonneville iterations eventually gave way to new Triumph classic lines, yet the T 120 II retained a loyal following thanks to its authentic character.

Highlights and Special Features of the Triumph T 120 Bonneville II

The T 120 Bonneville II enjoys a reputation for sturdy design, lively performance, and a racing-influenced visual identity. Notable is the ample torque delivered by its 650cc parallel-twin, the easily recognisable TT colour schemes, and its robust brake system with "twin leading shoe" design. The combination of collectable value, everyday usability, and spirited acceleration defines its appeal. Many examples have seen professional restoration, with original documents and plates highly valued by collectors.

Technical Data

Special Editions and Collectible Models

Models finished in period-correct Tourist Trophy colours remain in particularly high demand. Additionally, bikes retaining their original papers and UK registration plates are considered especially desirable. Some T 120s feature updated seats or electronic ignition, which increases practicality without substantially impacting originality.

Weak Spots and Common Issues

Like many classic British motorcycles, T 120s may exhibit minor oil leaks during extended operation, reflecting the construction of engines from this period. Refurbished bikes may feature replaced or upgraded seats and electrical components. While spare parts are generally accessible, condition and authenticity—such as original documents—play a critical role for collectors. Brake performance, especially from the period duplex drum, requires regular attention for safe operation.

Engine and Performance, Transmission and Handling

The 650cc parallel-twin of the Bonneville T 120 II is celebrated for its flexible torque and strong midrange acceleration, summarised by many as "pulls like a train." The engine delivers character through ample power delivery and a distinctive exhaust note. The model’s chassis favours stability and agility, while the braking system with twin leading shoes answers well to the dynamic demands of spirited riding. Electronic ignition, often fitted post-factory, increases start-up reliability and engine responsiveness. Across Classic Trader, the T 120 Bonneville II is the most-listed and most-viewed Triumph, a testament to its enduring fanbase and practicality.

Interior, Comfort, Exterior, and Design

True to British classic motorcycle design, the Bonneville T 120 II impresses with an instantly recognisable silhouette, chrome detailing, and an upright riding position. Special TT-influenced colour schemes and period-correct tank badges enhance visual appeal. Upgraded seats are common and improve rider comfort, but the most valued examples feature original pan and vinyl upholstery. Accessories such as period luggage racks or clubman handlebars are popular with enthusiasts aiming for either practical touring or a more sporting look.

Other Noteworthy Features

Owing to its widespread popularity, a significant number of T 120s have been sympathetically restored, with a ready supply of original and reproduction parts from specialist suppliers. Enthusiast forums and clubs support maintenance, sourcing, and technical improvements, ensuring these classics remain rideable for years.

Summary

The Triumph T 120 Bonneville II offers a blend of British engineering, authentic road presence, and a throaty parallel-twin sound. Its demand and supply data reflect its status as the quintessential Triumph classic. Robust support for maintenance and a strong enthusiast community make it a reliable entry point for classic bike ownership and enjoyment.