Insert for tubeless XC and Trail tires The lightest insert on the market - only 55g - for Cross-Country, Down-Country and Trail tubeless tires Progressive compression of the tire under load increases stability, grip and excellent rim protection In the event of a puncture, it allows run-flat driving with minimal power loss In the box: 1 light green Air liner tubeless insert 1 x 40mm Vittoria tubeless valve Fly the trails with the lightest, fastest XC & Trail tire insert Vittoria Air-Liner Light is the new insert for tubeless mtb tires that improves the performance and capabilities of the wheel-tyre system for Cross-Country, Down-Country and Trail use. Developed in collaboration with professional XC cyclists and mechanics, and used in the MTB World Cup stages, Air-Liner Light is the lightest and fastest MTB tubeless tire insert available on the market. Air-Liner Light is imperceptible and keeps the bike agile and fast. The insert allows progressive compression of the tire when it is under load. In this way, Air-Liner Light improves the driving sensation and increases stability and grip. In the event of a puncture and subsequent air loss, the Air-Liner Light expands, offering the support needed to reach the technical area, or the finish line, with minimal loss of time. Air-Liner Light also maximizes puncture protection. Thanks to the exclusive foam formulation, the insert allows extreme shock absorption and prevents tire punctures caused by strong impacts with the rim walls. Lightweight Air-Liner is compatible with mountain bike tires sizes from 29"x2.1" to 29"x2.4", with rim channels 25mm to 30mm wide, and with any type of liquid sealant. Lightweight Air-Liner should only be used in combination with tubeless tires and multi-way tubeless valves.