Vittoria Air-Liner Tubeless Insert - MTB, Large, 2.50-2.70"The Air Liner is a foam based, reusable insert for tubeless tires designed to protect the rim, enhance grip and prevent punctures. The system provides unmatched bump compliance, while ensuring bead lock at lower pressures. In the event of air loss, the Air Liner insert is designed for run flat use. Air Liner MTB features a round cross section with channels on the top and bottom providing room for a tunable air chambers, with full compatibility of all