A safety device for restraining the forward movement of a two-wheeled bicycle used for training a child, said device including a cord controller that allows for the extending, retracting and locking said cord to a manual handle, a spring clip fastener on the free end of said cord and a flexible strap that connects at one end by a loop to a bicycle seat post with the other end to a fastening ring that allows the ring to be fastened to the spring clip on the cord. The cord controller allows the user to walk behind a young child who is learning to ride a two-wheeled bike to prevent the child from accelerating away from the adult during training whereby the adult can restrain the forward movement of the bicycle whenever necessary.