The Michelin X Tweel Turf airless radial tire is one single unit, replacing the current tire/wheel/valve assembly. Please note, tire sold only as single unit!! Once they are bolted on, there is no air pressure to maintain, and the common problems of unseated beads and flat tires are completely eliminated. Consistent hub height which helps ensure the mower deck produces an even cut. The full-width poly-resin spokes provide excellent lateral stability for outstanding side hill performance, while the unique design of the spokes helps dampen the ride for enhanced operator comfort, even when navigating over curbs and other bumps. High performance compounds and an efficient contact patch are designed to provide a long wear life that is two to three times that of a pneumatic tire at equal tread depth. Designed to perform like a pneumatic tire, but without the risk and costly downtime associated with flat tires and unseated beads.