Hankook Optimo H725 Radial Tire - 235/55R18 99T Jointless full cover improve high speed stability and maximizes the tires road contact for improved handling. Introduction of new light-belt cord, lighter but stronger improves fuel economy and steering ability. Abrasion resistance tread compound improves abrasion resistance. Single strand bead wire enhances vehicle ride and uniformity. High hardness bead filler improves durability.