an off-road, gyroscopically balanced motor-bike with a caterpillar track

The Tuscan, contracted by the U.S. Forest Service, capable of climbing a 45-degree hill, featured a 20bhp single-cylinder engine with a four-speed gearbox; a front ski attachment for snow trails; and a detachable headlamp to double as a flashlight.

Via: http://hellforleathermagazine.com/2008/04/tuscan-trailbike-it-was-never.html