When was the motorcycle primary BELT invented?

The motorcycle primary belt drive system was developed in the late 20th century, with significant advancements occurring in the 1980s. While belt drives had been used in bicycles and other applications earlier, their introduction into motorcycles gained popularity as manufacturers sought to reduce maintenance and increase efficiency. Brands like Harley-Davidson began using belt drives in their models during the 1980s, contributing to the system's wider adoption in the motorcycle industry.