Lifeline lightweight road tubelifelines lightweight road tube provides excellent value for money and is ultra light at only 83 5g for the 48mm option and 84 5g for the 60mm produced from high quality butyl rubber and rigorously tested to guarantee no air leakage this lightweight road tube provides first class weight savings reliability and durability everything you want and need from an inner tube featuresmaterial butyl rubber0 90mm thick wallsair leakage testedgreat valuepresta valve