Jim Thiessen

Jim Thiessen: The Man Behind JIMS USA, Innovator in Harley-Davidson Performance Parts

For over 50 years, Jim Thiessen has been pushing the limits of speed and precision in the world of Harley-Davidson motorcycles. From the legendary Bonneville Salt Flats to the AHDRA races at Sturgis Dragway, Jim has been a vital figure in helping riders, record-breakers, and racers go faster. His company, JIMS USA, has become a trusted name worldwide, supplying certified Harley-Davidson mechanics and enthusiasts with top-tier products. In recognition of his remarkable contributions, the Sturgis Motorcycle Museum proudly inducted Jim Thiessen into its Hall of Fame.

Known simply as "Jim" among the go-fast crowd, his name carries weight in the world of high-performance V-Twin motorcycles. But his journey to becoming a legend in the industry began in a completely different field. Before he was an icon in motorcycling, Jim worked as a machinist in the aerospace industry. In 1967, he launched JIMS USA, initially to address the need for high-quality, hard-to-find parts. By the 1970s, Jim shifted his focus entirely to V-Twin motorcycles, recognizing the growing demand for American-made components in the Harley world.

His background in aerospace gave him an edge, instilling a commitment to tight tolerances and exacting standards. This precision helped him build a reputation for exceptional machining in the motorcycle industry. What began with a few manual mills and old lathes in a small shop grew into a company occupying over 50,000 square feet of state-of-the-art facilities in Camarillo, California, filled with cutting-edge CNC machines.

JIMS USA has become one of the industry’s leading producers of performance parts, tools, transmissions, and high-performance engines for Harley-Davidson motorcycles. The company's dedication to enhancing the rider's experience has made it a staple in workshops worldwide. With a research and development team constantly exploring new ways to generate more horsepower and reliability, JIMS USA remains at the forefront of innovation. Their commitment to manufacturing in-house ensures the highest American quality for every part they produce.

Despite his success, Jim is quick to credit his family and employees for JIMS' accomplishments. He runs the business with five of his six children, alongside a dedicated team of talented employees, many of whom share Jim’s lifelong passion for motorcycles. Together, they have built an enduring legacy rooted in integrity, product quality, and proven results.

Over the decades, word of mouth has turned JIMS USA into a household name among Harley-Davidson riders and mechanics. Whether on the racetrack or in the garage, Jim Thiessen’s influence is felt in every meticulously engineered part and in the countless riders who trust JIMS to power their performance. His legacy in the motorcycle world is cemented not only by his innovative contributions but also by his unwavering commitment to craftsmanship, family, and the love of riding.