sentences:  This style was designed in the early 90s by Grant Petersen for the Bridgestone XO-1, based on the semi-drop bars used by schoolchildren in Japan.Ape hanger handlebars rise in 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.