The Firestone FS591 tire is a line haul steer tire recommended for long distance highway routes. This tire is loaded with Firestone Tire's newest and best technology to ensure the highest possible removal mileage and EPA SmartWay® verified and CARB-compliant fuel efficiency. The Firestone FS591 tire helps deliver better fuel economy through a new technology in tire construction that reduces the overall weight of the tire without sacrificing durability. The innovative Ulti-Rib™ design on the outside shoulders of the tread helps combat the initiation and spread of irregular wear. The sipes on the rib edges also contribute to long tread-life by absorbing rib edge stresses in the road contact area of the tread.