- An engineered foam insert that mounts inside a mountain bike tire. It divides the inner volume of the tire in half, with air underneath the tread and the CushCore insert next to the rim - Absorbs impacts, reduces vibration and adds lateral stability to the tire - Third party testing has revealed that, compared to a standard tubeless setup, Cush Core provides a 12% smoother ride, 35% more sidewall stability, 16% less suspension travel consumption, 3% less rolling resistance, and 50% less impact force transferred to the rim - This system is designed to be used with tubeless ready or tubeless converted mountain bike rims and tires, as well as standard tubeless sealant - Doesn't absorb sealant like other tire inserts on the market - Includes special tubeless air valves that allow air to move through the valve without becoming obstructed by the insert Size / Tire W / Rim W / Package Weight 27.5" / 2.1-2.6" / 22-35mm / Pair 250g 29" / 2.1-2.6" / 22-35mm / Pair 260g 29"/27.5" / 2.1-2.6" / 22-35mm / Pair 260g 27.5" / 2.6-3.0" / 30-45mm / Pair 290g 29" / 2.6-3.0" / 30-45mm / Pair 290g 27.5" / 2.1-2.6" / 22-35mm / Each 250g 29" / 2.1-2.6" / 22-35mm / Each 260g 27.5" / 2.6-3.0" / 30-45mm / Each 290g 29" / 2.6-3.0" / 30-45mm / Each 290g