Scot Alexander Breithaupt (July 14, 1957 – c. July 4, 2015) was an American motorcycle motocross enthusiast, bicycle racer and entrepreneur long associated with the birth and popularization of bicycle motocross (BMX) in the early 1970s. Active as a competitor, track builder, promoter and manufacturer, he is often described as one of the founding figures of organized BMX racing in Southern California and beyond.

Early role and activities

Breithaupt began riding and organizing informal races when young people started imitating motorcycle motocross events on bicycles. He helped turn ad hoc neighborhood contests into structured competitions with purpose-built dirt tracks, classes by age and ability, and simple rules that could be replicated. Through organizing events, promoting races and coordinating teams, he played a substantive part in shaping the grassroots culture that became modern BMX.

Business and equipment

Beyond promoting races, Breithaupt moved into the business side of the sport. He established enterprises to manufacture, market and distribute BMX frames and components, most notably SE Racing (often rendered as Scot Enterprises or SE). SE Racing produced several influential frames and models that became popular among racers and collectors. The company’s products helped standardize certain frame features and made competition-ready bicycles more widely available to young riders.

Contributions and influence

  • Organized early competitive BMX events and helped set formats that spread to other communities.
  • Promoted teams and youth participation, contributing to BMX’s transition from pastime to organized sport.
  • Founded or operated businesses that manufactured BMX frames and parts, helping commercialize the discipline.

Breithaupt’s efforts are part of what allowed BMX to grow from local streets and dry riverbeds into a worldwide sport with sanctioned series, international competitions and an enduring culture of racing and freestyle riding.

Later life and death

In later years Breithaupt remained a recognizable figure in BMX history, attending events and interacting with successive generations of riders and fans. He died in early July 2015; authorities reported he was found dead in a tent where he had been living in a vacant lot in Indio, California. Contemporary news accounts and remembrances described his significant early contributions to the development of BMX and his complicated personal story. For a contemporary report, see news coverage.