CushCore is an engineered foam insert to be mounted inside a tire, designed to absorb impacts, reduce vibration and increase lateral stability. These characteristics translate to a more controlled, comfortable, and faster ride.CushCore XC is a lightweight foam tire insert designed for cross-country racing, light trail riding, and/or less aggressive ridersInserts are designed to absorb impacts, reduce vibration and increase lateral stabilityProvides a more controlled, comfortable, and faster rideInserts reduce rolling resistance which allows for better forward momentum through rough terrainCushCore XC fits tire widths 1.8" to 2.4" and inner rim widths 22mm to 32mmWeight: 150 gThe system is designed to be used with tubeless-ready or tubeless converted rims and tires, and is compatible with tubeless tire sealantsThe insert divides the inner volume of the tire in half, maintaining air underneath the tread and the foam insert next to the rimValve stem included CushCore Foam Tire Inserts - Singles Tubeless Conversion Kits UPC: 701822997690