The 1939 Triumph Speed Twin is a motorcycle that was made by Triumph at their Coventry, and later Meriden factories. Edward Turner, Triumph’s Chief Designer and Managing Director, launched the Triumph Speed Twin at the 1937 National Motorcycle Show. It was a 500 cc OHV vertical twin in a lightweight frame and the first truly successful British parallel twin, setting the standard for many twins to follow. After World War II the Speed Twin was responsible for the survival of Triumph - and every major British marque offered a 500 cc twin designed on similar lines to the Speed Twin.
Edward Turner’s Triumph twin was a major turning point for the British motorcycle industry, as although a 500 cc parallel twin of medium capacity was not revolutionary, the 5T Speed Twin model was lighter than many contemporary singles with significantly more power and torque. Its performance proved exemplary for a road-going 500, better than 100mph being attainable under favorable conditions. Early models were only available in 'Amaranth red' with hand painted gold pinstripes to set off the chrome.
Background
- Manufacturer: Triumph Engineering Co. Ltd.
- Year: 1939
- Model: Speed Twin
Specifications
- Engine: The 1939 Triumph Speed Twin is powered by a 498cc (0.498L) air-cooled, four-stroke, parallel-twin engine. This engine configuration was revolutionary at the time, delivering around 27 horsepower at 6,000 RPM, offering smooth and powerful performance.
- Transmission: The motorcycle features a four-speed manual transmission with a hand-shift, which was standard for the era.
- Chassis: The Speed Twin is built on a steel tubular frame, designed for strength and rigidity while keeping the weight relatively low, enhancing handling and stability.
- Suspension: The front suspension consists of girder forks, while the rear features a rigid frame. This setup was typical of the period and provided a balance between ride comfort and handling.
- Brakes: The motorcycle is equipped with drum brakes both at the front and rear, offering reliable stopping power.
Design and Features
- Body Style: The Triumph Speed Twin features a classic British motorcycle design, characterized by its elegant and streamlined appearance. It has a teardrop-shaped fuel tank, a single seat, and minimalist bodywork, emphasizing both function and style.
- Design Elements: The motorcycle includes distinctive features such as the Triumph badge on the fuel tank, chrome accents, and spoked wheels. The design reflects Triumph’s commitment to quality and aesthetics.
- Instrumentation: The Speed Twin includes basic instrumentation, typically a speedometer and an ammeter, providing essential information to the rider.
Performance
- Speed: The Speed Twin is capable of reaching speeds of around 90 mph (145 km/h), making it one of the fastest motorcycles of its time.
- Acceleration: The parallel-twin engine provides smooth and responsive acceleration, ideal for both city commuting and open-road cruising. It offers a refined and enjoyable riding experience.
- Handling: The Speed Twin offers excellent handling characteristics, thanks to its lightweight frame and well-balanced design. It is known for its agility and stability, making it a favorite among riders who appreciate a classic and responsive motorcycle.
Historical Significance
- Engineering Innovation: The Triumph Speed Twin was revolutionary for its use of a parallel-twin engine, which set new standards for performance and reliability in the motorcycle industry. This engine design became the blueprint for many future motorcycles.
- Impact on the Industry: The Speed Twin played a crucial role in establishing Triumph as a leading manufacturer of high-performance motorcycles. Its success influenced the design and engineering of motorcycles for decades to come.
- Cultural Impact: The Speed Twin became a symbol of British engineering excellence and style, contributing to the global popularity of Triumph motorcycles. It was widely used by both civilian riders and the military during World War II.
Legacy
- Collector's Item: Today, the 1939 Triumph Speed Twin is a highly sought-after collectible among vintage motorcycle enthusiasts. Its historical significance, engineering innovation, and classic design make it a valuable addition to any collection.
- Cultural Appreciation: The Speed Twin is appreciated for its role in the development of modern motorcycles and its contribution to the rich history of motorcycling.
- Enduring Appeal: The bike’s combination of vintage aesthetics, reliable performance, and agile handling ensures its continued interest among collectors and motorcycle aficionados.
You maypurchase a print of the 1939 Triumph Speed Twin in our online gallery.
