Vittoria Air-Liner Tubeless Insert - Road, Small, 25mmThe 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. Enhanced rim and tire protection, allows for lower tire pressures, and run flat capability to always get you back home Designed to be used with sealant