Systems, methods and computer program products are provided for managing a plurality of tires from their procurement through their disposal. The bracket includes a cylindrical portion extending along the shaft and a folded portion formed by folding the upper end of the cylindrical portion onto the outer diameter side. An opacity count is generated indicative of contaminants andor bubbles in the liquid. The relief time increases as the thickness of the work piece grows. The mold is useful in compression molding processes used in the preparation of unitized membrane electrodes. New nodes added to the network learn from other nodes in the network what content they should have and download the required content, in a desired amount, onto their local storage devices from the nearest and least congested nodes without interrupting network operation.