Air Loc Brand 13.6/14.9-28/30 13.6/14.9R28/30 Farm Tractor/Implement Inner Tube with TR218A Valve Stem 13.6-28/30 14.9-28/30 Farm Tractor/Implement Inner Tube with TR218A Valve Stem 13.6R28 14.9R28 13.6R30 14.9R30 May be used in both Bias and Radial Applications