The Michelin X Line Energy Z Steer Tire features a patented dual compound tread and fuel efficient casing. The mileage top layer controls tread stiffness and stress to reduce irregular wear. The retreadability bottom layer minimizes internal casing temperatures for low rolling resistance and extended casing life. The decoupling grooves and directional miniature sipes provide even wear to the end of tread life. The tire is approved for use on EPA SmartWay certified equipment and meets California CARB requirements.