Running on a Russian tank engine, a giant motorcycle dubbed as Led Zeppelin by its creator has been duly acknowledged by the Guinness Book of Records as the world's heaviest motorbike.

The bike weighs four-and-a-half ton and measures 17 feet four inches long by seven feet six inches tall prompting creator Tilo Nieber, to remark, "You don't get much more heavy metal than this."

Nieber, 39, said it took more than a year for a team of welders and mechanics almost a year to build the bike at the Harzer Bike Schmiede in Zilly, Germany.