Abstract: A locking device (1), especially suitable for clamping onto motor vehicle wheels. It consists of a generally elongate lock case (2) and a first and second grip arm (3, 4), each connected to one end of the lock case. The grip arms (3, 4) are designed to grip from opposite sides at least partly around the edge of the wheel so that the lock case (2) lies essentially parallel to the axis of the wheel. The first grip claw (4) is slideably received in the lock case (2). The novelty of the invention resides in that in the lock case (2) there is provided a toothed bar (11) connected at one end to one of the grip claws (3), which, when the lock is in a locked state, engages with a check pawl (14). The check pawl (14) is operatively connected to the second grip claw (4). The lock case may also be equipped with a spring (17) for drawing together the two grip claws (3, 4).