Inner Tubes Michelin Airstop tubes are used by those who want the very best Feature an overlap splice that is stronger than the butt splice used in most others Splice is always placed opposite the valve, which helps to provide a more balanced tube All off-road tubes are NHS coded (Not for Highway Service) Do not use on rim types CP or MT H2 DUTY Heavy Duty FOR RIM SIZE 21? INNER TUBE VALVE STEM TYPE EU 34G| TR-4 INNER TUBE VALVE STEM TYPE US TR-4 (round base) Center Metal Valve (threaded and nuts) MATERIAL Rubber PRODUCT NAME Inner Tube TUBE FITS TIRE SIZE 2.75-21 TYPE Offroad UNITS Each