Abstract: A connector device for connecting and towing a wheeled cart to and by a bicycle, having an elongated shaft including an aligned bolt with a head and having a front longitudinally aligned socket. A pivot ball, secured to the towing bicycle, and adapted to be removably held in the socket of the device. A slidable sleeve on the shaft over the socket extension of the device for so removably holding the ball in the socket in one slidable position thereof on the shaft. A removable spring sleeve holding clamp on the shaft. A rotatable slidable collar extending over the shaft extension. A coil extension spring on the bolt portion of the shaft, between the bolt head and said collar, with said slidable rotatable collar being adapted to have the towed cart tongue secured thereto. Said connecting device permitting a rotation of either the bolt or said collar of the device, with relation to each other upon bicycle torque pulling of the towed cart, on device connection use.