Trans American 11x4.00-5 / 11x4.50-5 / 11x6.00-5 Inner Tube with TR87 Bent Metal Valve Stem Quality Trans American 11x4.00-5 / 11x4.50-5 / 11x6.00-5 inner tube. TR87 bent metal valve stem Perfect for go karts, mowers, and all kinds of power equipment.