Lifeline dh mtb tubethe rough and tumble terrain of downhill riding demands thicker durable and reliable tubes to cope with the rock strewn and root infested trails pinch flats are all too common so lifeline has designed their dh mtb tube with thicker tube walls to combat this ride wrecker rigorously air tested for reliability and durability lifelines butyl tube will roll with the terrain featuresbutyl tuberigorously tested for reliability and durabilityschradler or presta versionsetrto