THE concept of a single wheeled motorcycle is one which has intrigued designers through the ages. Various people have experimented with the format but the idea has never really caught on, partly because the single wheeled layout is inherently unstable without significant design and development, and the end result has never really been enough to justify the time and resources required to make it work. So the monocycle, or monowheel, has remained a novelty on the sidelines of motorcycle development history. Until Kerry McLean came along, that is. * www.classicmechanics.com