Cooper Tires Discoverer SRX All-Season Radial Tire - 255/65R18 111T Tire Only 65,000 Mile Treadwear Protection Free 45-Day Road Test 3-D micro-gauge dimple sipes maximize tread contact with the road surface to grip the road better Optimized 5-rib tread pattern evenly distributes the load across the tire's contact patch leading to improved tread wear, responsiveness and handling