The Invincible 750 Super was a model of motorbike manufactured by Rosenbaum's in or prior to 1976, which featured a three-cylinder, 45-horsepower engine and could reach a top speed of 112 miles per hour. Sirius Black had a poster advertising this motorbike in his bedroom at 12 Grimmauld Place during his youth in the 1970s. It was still there in 1997 when Harry Potter, Ron Weasley, and Hermione Granger took refuge in the house following their escape from the wedding of Bill Weasley and Fleur Delacour.