Several years ago, drawings of a trike on a patent application by Harley-Davidson appeared on the Internet. The drawings depicted a leaning trike – a vehicle with a suspension system that allows leaning while cornering, just like motorcycles do. Recently, it turned out that Harley even made several prototypes of the mysterious leaning trike. The prototypes, powered by a 45-degree air-cooled V-Twin engine, were produced under the code name Penster and designed by legendary custom car builder John Buttera.
The photos with the orange trike show the final prototype from 2006, while the burgundy trike is the early prototype from 1998. The prototypes are now displayed in the Harley-Davidson museum.