And here is clip of a re-creation of the original stunt to verify it was really possible on an old school Triumph
Below is the original clips from the movie The Great Escape
Check out this commercial for Shell that honors one of the greatest motorcycles scenes ever to be filmed. Steve McQueen rode the bike in the original except it was Bud Akins that did the stunt jumping the fence. This is a cool reenactment that honors that legendary scene.