Abstract: A tandem wheel attachment for hindering movement of a vehicle having tandem wheels; it comprises a T-shaped member adapted to be secured between the tandem wheels, and a wheel bracing member which securely engages one extremity of the T-shaped member and covers a major portion of the outer face of the outer wheel hub. Mounted to the T-shaped member is a piercing element in contact with the tires but which will pierce the tires only if the wheels are rotated with the attachment thereon.

Abstract: A clamp attachment for preventing rotation of the wheel of a vehicle, such as an automobile or truck. Designed to be mounted on site, the attachment comprises two hingedly connected members adapted to engage the inner and outer faces of the wheel rim. A swivel bolt extends in both members. One end of the bolt is engageable with a wrench which is used to move the members relative to one another about the hinge axis. The wrench remains in engagement with the end of the swivel bolt when the attachment is in a clamp engagement with the vehicle wheel and serves as part of the locking mechanism.