Honda introduced the CB450 in 1965 as one of its first large-displacement road motorcycles and a flagship intended to compete with established European big bikes. The model quickly became significant for its advanced twin-cylinder layout and for showing that Honda could build a sophisticated, high-performance middleweight with broad international appeal. In Honda’s own history, the CB450 is described as a major response to the European market, and it was exported mainly to the United States, where it helped establish Honda’s reputation beyond small-displacement commuters.
The nameplate went through several updates during its original run. A major revision arrived in 1968, bringing further refinement to the chassis and engine character. Honda also continued to develop export-oriented versions, including the CB450 Export for markets outside Japan. In Japan, the line evolved through later versions such as the CB450 Senior, which reflected the model’s gradual move from cutting-edge newcomer to a more mature road sport machine.
By the mid-1970s, the CB450 had been overtaken by newer Honda designs and was succeeded by the CB500T in 1974. Even so, the CB450 remains an important early milestone in Honda motorcycle history: it was one of the models that helped establish the company’s credibility in larger, more technically ambitious street motorcycles and made the CB designation a long-running part of Honda’s performance image.