Cushcore Trail Tire Insert - 27.5/29", Mixed PairCushCore 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. 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