CUSHCORE PRO TIRE INSERTS SINGLE 27. 5"At the core of every great ride Cush Core Pro inserts are engineered foam inserts that mount inside a mountain bike tire. They divide 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. Features Compatible with 27. 5" wheels and tires Provides protection to both tire and rim Improves ride quality by acting as tire suspension | Cushcore | Pro Tire Inserts Single 27. 5" 27. 5" 2. 1-2. 6" Tires (Single)