Trans American 16.9-24 17.5L24 Inner Tube with TR218A Valve Stem Heavy duty inner tube for tire sizes 16.9-24, 17.5L24, 16.9R24, and 17.5LR24. Tractor/implement inner tube with TR218A valve stem. For use in bias or radial tires. Fits metric sizes 420/70R24 and 480/65R24.