The Tri-Magnum is a three wheeler DIY
project designed by Robert Q. Riley
. The drivetrain is a high-CC motorcycle rear end mated to a simple steel frame which in turn mates to a VW beetle front suspension. A simple body of wood, urethane foam, and fiberglass is constructed. The vehicle's plans are the best sellers at Robert Q. Riley's site. The plans debued in the February 1983 issue of Mechanix Illustrated
magazine but are now available for purchase from the designers website. Some states recognize the Tri-Magnum as a motorcycle, some as a car, and others as a Specially Constructed Vehicle. To comply with state laws some people have added a single motorcycle
head light in addition to the two regular car headlights.