The CushCore Pro 27.5" Tire Inserts are engineered foam inserts to be mounted inside a tire, designed to absorb impacts, reduce vibration and increase lateral stability. The system is designed to be used with tubeless-ready or tubeless converted rims and tires and is compatible with tubeless tire sealants. A specially designed tubeless air valve is included with each insert; allowing air to move through the valve without becoming obstructed by the insert. The insert divides the inner volume of the tire in half, maintaining air underneath the tread and the foam insert next to the rim. Ride your best with the CushCore Pro 27.5" Tire Inserts!