Always needed. Quality tested and a great value, the 0.9mm thick butyl rubber innertube strikes the perfect balance between weight and durability. Schrader Tube 40mm & 70deg Valve Features Schrader valve (American valve) with a removable valve core 0.9mm wall thickness Each tube passes a 24 hour air hold test prior to packaging Presta Tube 48mm, 60mm & 80mm Valve Features Presta valve with a fixed/non-removable valve core 0.9mm wall thickness Each tube passes a 24 hour air hold test prior to packaging