Before sport quads and the modern ATV industry, there were three-wheelers—and an entire performance industry being figured out along the way. Leonard Duncan looks back at the early days of the Honda ATC, the builders and racers who pushed these machines beyond their original purpose, Danny Duncan’s role in that developing industry, and how lessons learned nearly 50 years ago still influence ATV performance today.

What was your first three-wheeler, and which machine or racer from that era do you remember most? Share your stories in the comments and tell us what part of three-wheeler history we should cover next.