AJS M12 – 245cc 1928


The AJS M12 245cc from 1928 is a significant motorcycle from the renowned British manufacturer AJS (Associated Motor Cycles). Here’s a comprehensive overview of its specifications, manufacturer design, legacy, and interesting facts:


  • Engine: 245cc single-cylinder, four-stroke engine.
  • Power: Approximately 6.5 horsepower.
  • Transmission: 3-speed gearbox.
  • Frame: Typically a rigid frame with leaf-sprung front forks and rigid rear suspension.
  • Brakes: Drum brakes (likely mechanical).

Manufacturer Design:

AJS designed the M12 to cater to the needs of the commuter and leisure rider markets of the 1920s. It featured a compact and economical engine, coupled with robust construction to handle the road conditions of the time. The design aimed to provide reliability and ease of maintenance, crucial aspects for the average rider of the era.


  1. Historical Significance: The AJS M12 contributed to the brand’s reputation for producing reliable and accessible motorcycles during the interwar period. It represented AJS’s commitment to craftsmanship and quality, which helped solidify its place in the competitive motorcycle market of the time.
  2. Popularity: As a mid-range motorcycle, the M12 was popular among riders seeking a balance of affordability, reliability, and performance. Its practical design and dependable engineering made it a preferred choice for daily commuting and light touring.
  3. Engineering Evolution: The M12, like other AJS models of its time, showcased advancements in motorcycle engineering, such as improved engine efficiency and enhanced suspension systems, aimed at providing a smoother ride experience.

Most Interesting Facts:

  1. Innovation in Design: The M12 might have introduced innovations such as improved carburetion or ignition systems, typical of AJS’s approach to continuously refining their motorcycles based on technological advancements and rider feedback.
  2. Versatility: The M12’s design versatility allowed it to be adapted for various purposes, from urban commuting to occasional off-road use, highlighting its practicality and adaptability.
  3. Collector’s Item: Due to its historical significance and relatively limited production numbers, the AJS M12 is now highly prized among vintage motorcycle collectors and enthusiasts worldwide.


The AJS M12 245cc holds importance as a representative model of early 20th-century British motorcycle engineering, embodying AJS’s commitment to reliability, craftsmanship, and innovation. Its legacy includes influencing subsequent AJS models and contributing to the brand’s enduring reputation for quality motorcycles.

In conclusion, the AJS M12 245cc remains a notable example of classic British motorcycle design, valued for its simplicity, reliability, and historical significance in the evolution of motorcycles during the early 20th century.


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