In 1970, renowned racer Calvin Rayborn II, or Cal Rayborn, behind the bars of the Harley Davidson Sportster Streamliner, set a new land speed record of 265.492 mph on the Utah Bonneville salt flats, a record that remained unbroken until 1975. The streamlined, stiletto-shaped machine was equipped with a Sportster engine that ran on 70% nitro-methane, had a 23" diameter and a wheelbase of just over 10 feet.