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
Roadmaster (bicycle company) Illinois, where it built a new factory on a site that would remain the company's principal bicycle manufacturing location into the 1990s. Products manufactured there were children's vehicles, sidewalk bikes, toy autos, tricycles, garden tractors, seat cars and wagons and playground equipment. The company produced over 100,000 miniature Mustangs for Ford Motor Company late in the 1960s. BMX bikes, mopeds and exercise bicycles were introduced in the 1970s. After two decades of consistent growth, the AMF Wheel Goods Division stalled under the long-distance management of a parent company bogged down in layers of corporate management and marginally profitable product lines.