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
USS Chopper (SS-342) USS Chopper (SS-342) USS "Chopper" (SS/AGSS/IXSS-342), a submarine, was the only ship of the United States Navy to be named for the chopper, a bluefish common in the rivers of the Mississippi Valley. Her keel was laid down by the Electric Boat Company in Groton, Connecticut. She was launched on 4 February 1945 sponsored by Mrs. G. S. Beebe, and commissioned on 25 May 1945 with Lieutenant Commander S. Filipone in command. "Chopper " sailed from New London, Connecticut on 4 July 1945 for Pearl Harbor, where she lay from 21 September-24 October. On 30 October, she arrived at San