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.E-MTB is specifically designed for the increased weight and forces of an E-mountain bikeDesigned for Tire Widths: 2.3 -2.8 Fits Inner Rim Widths: 22mm-35mmThe 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 System Enhancements UPC: 850048765146