Abstract: This invention relates to a collapsible bicycle and in particular to one including a top tube, a seat tube pivotally connected with one end of the top tube, a down tube pivotally connected at the lower end with a lower end of the seat tube and being collapsible at the intermediate portion, a reinforcing tube pivotally connected at the upper end with an intermediate portion of the top tube and having at the lower end two rollers and a spring-loaded positioning member adapting to groove and the recess of the down tube respectively, a head tube fixedly connected with down tube and pivotally connected with the top tube, a handlebar composed of a major bar and an auxiliary bar, and two crank arms pivotally connected with an axle of the bicycle and being able to be folded in alignment with center of the axle.

Abstract: A foldable bicycle which is characterized by a top bar of the main frame having two angled and pivotally connected sections allowing the front portion of the bicycle to be folded downwardly and backwardly toward the rear portion of the frame by a two-piece support bar provided between the main frame and the saddle pillar of the bicycle, which has a control lever to quickly separate the support bar for folding purposes, by a handle-bar stem having a locking mechanism at its lower portion which has a pulling arm for quickly controlling the bending or straightening of the handle-bar stem; and by a pair of pedals which may be turned inwardly due to a special connection thereof, the bicycle is easily folded.