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The Italian brand Tubolight has come to market with a new, innovative Diamana tyre liner. It's no longer just about inserting a piece of moulded polyethene foam into the tyre. It will only protect the rim in a more brutal impact or allow you to make an emergency return home after a puncture. Science comes into play. At the beginning of the Tubolight Diamana liner, a study looked at the movement of air molecules inside the tyre as it deformed due to external forces.