Cush Core Tire Insert Single Gravel/CX-700C Tires Cush Core is an engineered foam insert that mounts inside a bike tire. It divides the inner volume of the tire in half, with air underneath the tread and the Cush Core insert next to the rim. The purpose of Cushcore is to improve the ride quality of your bike. It is not just for flat protection. Cush Core absorbs shock, stops deflection off obstacles, reduces vibration, and stabilizes the tire against roll and squirm. Think of it as suspension for your tires designed to give you a faster, smoother ride. This system is designed to be used with tubeless-ready or tubeless converted mountain bike rims and tires. Cush Core is compatible with tubeless tire sealants. The specially designed tubeless air valves are included with each set. The air valve allows air to move through the valve without becoming obstructed by the insert. This Cush Core Tire Insert is a single tire insert and is for Gravel or CX bikes with 700C tires, 33-46mm rims. Features Compatible with 700C tires, 33-46mm rims. Provides protection To both tire and rim. Improves ride quality By acting as tire suspension. | Cushcore | Tire Insert Single Gravel/cx 700C, 33-46Mm Tires (Single)