Which is the world’s biggest motorcycle? Ideally, the easiest way to find out would be to consult the Guinness World Records book. According to them, not the biggest but the Tallest Rideable Motorcycle called Dream Big was built by Gregory Dunham in California in 2005. In the video below, Dunham holds the Guinness World Records Book 2007, published in August 2006.
How big is Dream Big? It is 11 feet 3 inches (3.429 meters) tall from where the wheels touch the ground to the top of the handlebars. The bike is 20 feet 4 inches (6.187 meters) long and weighs 6,500 pounds (2.948 tonnes). Dream Big is powered by a 502 cubic inch V8 engine and its tires are more than 6 feet (1.88 meters) tall.
But since 2007, a motorcycle called Monster Motorbike has been built in Australia by Aussie Ray Baumann for the Melbourne International Motor Show 2008. This Australian monster bike weighs 13 metric tons (28,659 pounds) and is 9 meters (30 feet) long. It’s powered by a Detroit Diesel truck engine. Its height is unknown. Ray, a former stunt driver, apparently created the bike “to crash things for fun.”
Monster Motorbike is unofficially the longest motorcycle—compare its 30 feet length to the 20 feet of Dream Big. And since much of Dream Big‘s height comes from the handlebars, I would say that Monster Motorbike is the biggest motorcycle in the world; Dream Big is the second biggest.