Abstract: The present invention provides a rear-wheel steering structure of light bicycle. The rear-wheel steering structure comprises a transmission link, a steering link, a rotation axis, and a hub base. One end of the transmission link is pivotally joined with the steering link. The other end of the steering link is pivotally joined with one end of the rotation axis. The upper end of the hub base is pivotally joined with one end of the rotation axis. The other end of the hub base is pivotally joined on a small wheel. Through the action of the transmission link, the steering link is led to turn about, and the rotation axis and the hub base are simultaneously driven to double the turned angle of said small wheel, hence shrinking the space of return, enhancing the flexibility of steering angle, and achieve convenience in ride.

Abstract: A dual-shaft link direction control structure of a light bicycle comprises a fixing rod, an upper turntable, a lower turntable, two auxiliary rods, and a link. The rear end of the fixing rod is connected with the front-end portion of a frame of a light bicycle, and the front end thereof is inserted by a control handle pivotally connected with the upper and lower turntables. The upper and lower turntables are pivotally connected with the two auxiliary rods. One end of the auxiliary rods is pivotally connected with one end of the link. The other end of the link is pivotally connected with a front fork portion of the light bicycle. The upper and lower turntables, the two auxiliary rods, and the link can facilitate direction control and ride of the light bicycle. Moreover, the volume of the light bicycle can be shrunk, hence achieving convenience in use and storage.