BFirestone 11.212.4-28 Inner Tube with TR218A Valve Stem ReviewbP PP Firestone 11.212.4-28 Inner Tube with TR218A Valve Stem PQuality Firestone 11.2R28 12.4R28 inner tube.PTR218A valve stem for air and liquid operations.PFor use in bias and radial tires. 11.2-28 12.4-28.