The Cush Core XC 29 is designed to provide the perfect balance of weight, performance and protection for 29" mountain bike tires. The ultra-lightweight tire insert reduces the tire's rolling resistance and increases grip, while providing a smoother ride and reducing the risk of punctures. The air-filled core absorbs shock and vibration, increasing comfort and control of the bike, especially on technical terrain. The Cush Core XC 29 is an indispensable component for XC riders looking to maximize performance and enjoyment during long and challenging rides.