Bicycle handlebar a steep U-shape from the base, so that the rider's hands rest above waist-level. This style of bicycle handlebar became very popular in the 1960s after the introduction of wheelie bikes such as the Schwinn "Sting-Ray", Raleigh Chopper, and other highly stylized youth bicycles that imitated the appearance of drag-racing or chopper motorcycles of the day. Legislation in the United States introduced during the 1970s limited the maximum height of manufacturer-installed handlebars to 16 inches above the lowest seat setting; European Union safety regulations use a similar limit of 400mm. The apehanger style remained common in the US through the
Schwinn Bicycle Company to sell during the inevitable downturns in business cycles. After traveling to Europe to get ideas, F. W. Schwinn returned to Chicago and in 1933 introduced the Schwinn B-10E Motorbike, actually a youth's bicycle designed to imitate a motorcycle. The company revised the model the next year and renamed it the "Aerocycle". For the "Aerocycle", F. W. Schwinn persuaded American Rubber Co. to make balloon tires, while adding streamlined fenders, an imitation "gas tank", a streamlined, chrome-plated headlight, and a push-button bicycle bell. The bicycle would eventually come to be known as a "paperboy bike" or "cruiser". Schwinn was soon