Abstract: A safety device for restraining a multiple part rim during the inflation of a truck tire is designed to be used on a hydraulically adjustable platform of a service vehicle. The device includes a top restraint frame that is designed to be mounted on horizontal frame members of the vehicle and is slidable between a storage position under the vehicle body and a position above the adjustable platform. Before the tire is inflated, the assembled tire and rim are placed on the platform and the top restraint frame is pulled over them. A chain is fastened to both the platform and the restraint frame and is passed through the central opening in the rim to restrain the tire and rim parts from too much lateral movement.