Heaviest Motorcycle Guinness World Records Set by Harzer Bike Schmiede The Harzer Bike Schmeide – World Heaviest Motorcycle built by Tilo Niebel of Zilly, Germany, which weighed 4.749 tonnes (10,470 lb) on 23 November 2007. The Massive Machine, Which is 5.28 m (17 ft 4 in) Long, 2.29 m ( 7ft 6 in) tall and powered by a Russian tank engine, took a team of welders and mechanics nearly a year to build.