Ultra Heavy-Duty Inner Tube Provide enhanced protection against punctures and pinch flats Reinforced tubes for off-road applications Feature a 4mm wall thickness DUTY Ultra Heavy Duty FOR RIM SIZE 18? 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 MOUNTING POSITION Front| Rear PRODUCT NAME Inner Tube TUBE FITS TIRE SIZE 100/100-18| 120/90-18| 130/80-18 TUBE THICKNESS 4.0 mm TYPE Enduro| MX| Offroad UNITS Each