The device comprises a base block of material mounted on the frame bar of a bicycle which extends downwardly and rearwardly from the front fork. The block is mounted beneath the bar at the point closest to the adjacent front wheel and tire. The block is provided with rectangular cut out portions at the bottom front end corners. The cut out portions are provided with aligned pivot openings extending laterally from each side. A heavy spring wire frame is provided with spaced parallel arms having inwardy extending bent ends adapted to enter the aligned openings to pivotally mount the frame on the block. The outer end of the frame comprises an integral arcuate loop which is bent at almost right angles to the spaced arms. Beneath each pivot opening, the block is provided with an elongated raised rib which is adapted to hold the frame arms in a horizontal position with relation to the block. In use, the frame is pulled down towards the tire, the arms resiliently riding over the ribs, until the bent loop engages the tire and swings slightly rearwardly to firmly engage the tire and wheel on the top and on each side of the tire. This effectively locks the wheel against rotation and against turning out of the plane of the bicycle frame. The bicycle can easily be parked by leaning against a wall and it will not slip or fall. When the rider takes the bicycle and moves it forwardly, the tire will force the wire frame forwardly and kick it out of the way into the initial position with the arms over the ribs. The ribs serve to keep the wire frame arms in this position. Provision can be made for preventing the pullout of the frame arms from the pivot openings.