BSA B31 – 350cc – 1959


The BSA B31 350cc, produced in 1959, is a significant model from Birmingham Small Arms Company (BSA), a renowned British motorcycle manufacturer. Here’s a comprehensive overview of its specifications, manufacturer design, legacy, and interesting facts:


  • Engine: 348cc air-cooled single-cylinder, four-stroke engine.
  • Power: Approximately 18 horsepower.
  • Transmission: 4-speed gearbox.
  • Frame: Steel duplex cradle frame.
  • Suspension: Telescopic front forks, swinging arm rear suspension with twin shock absorbers.
  • Brakes: Drum brakes (front and rear).

Manufacturer Design:

The BSA B31 was designed as a versatile and reliable motorcycle suitable for everyday commuting and touring. It featured a robust frame, a dependable engine, and comfortable suspension, aimed at providing a smooth and enjoyable riding experience.


  1. Popularity: The B31 was popular among riders seeking a dependable and affordable mid-sized motorcycle. Its balanced performance and sturdy construction made it suitable for various riding conditions.
  2. Durability: Known for its durability and ease of maintenance, the B31 contributed to BSA’s reputation for producing motorcycles that could withstand long-distance travel and frequent use.
  3. Engineering Advancements: The B31 incorporated technological advancements typical of BSA’s approach to motorcycle design, including improvements in engine performance, braking systems, and suspension components.

Most Interesting Facts:

  1. Variants: BSA offered different variants of the B31 throughout its production run, catering to various market preferences and regulatory requirements.
  2. Sporting Heritage: The B31 platform was also used in competitive racing events, showcasing its versatility and performance capabilities on the track.
  3. Collector’s Item: Today, the BSA B31 is highly regarded among vintage motorcycle collectors and enthusiasts for its classic design, reliability, and historical significance.

Conclusion: The BSA B31 350cc holds significance as a representative model of mid-20th-century British motorcycle engineering. It reflects BSA’s commitment to producing motorcycles that combined practicality with performance, appealing to a broad range of riders.

In conclusion, the BSA B31 350cc remains a respected example of classic British motorcycle design, valued for its reliability, versatility, and enduring appeal among motorcycle enthusiasts worldwide. Its legacy includes influencing subsequent BSA models and contributing to the brand’s reputation in the motorcycle industry during the 1950s and beyond.


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