This is one mother of a bike. Clemens Leonhardt built what he calls the “world’s biggest motorcycle” at 3.47 meters in length and weighing 650 kg. The Leonhardt Gunbus has a 410-cubic inch, air-cooled, two-cylinder V-type engine. The tires, manufactured by Rigdon, are 38 x 11 and 42 x 15-inches. This is no prototype. Leonhardt not only plans to market them, he is working on a side car to go with his monstrosity. Contact the company for price and more details.