The NEW superlight and superfast mtb insert for tubeless XC & Trail tyres that enhances suspension and with the ability for run-flat riding in the event of a puncture. Air-Liner Light is the lightest and fastest insert for tubeless mtb tyres available in the market. With its 50g weight, Air-Liner Light is imperceptible and keeps the bike handling agile and fast. The shape of the insert is designed for a perfect fit with rim channels from 25mm to 30mm wide. In case of a tyre puncture and consequent air loss, Air-Liner Light expands, offering excellent support to the tyre. The foam is made of open cells which can retain their own air pressure and releases the air held within the foam cells once the tyre starts to lose air. By doing so, Air-Liner Light expands in size and offers increased support to the wheel-tyre system, allowing run-flat riding.