Cooper Discoverer S/T MAXX Radial Tire - 255/80R17 121Q Armor-Tek3 carcass construction contributes to the durability of the S/T MAXX by adding strength to the sidewall and tread area. Blended natural rubber and silica based provides exceptional wet traction and confident handling on the highway, while also delivering excellent cut and chip resistance on unpaved, rocky and gravel terrain. Stone ejector ribs help to discharge stones and resist stone drilling. Enhanced buttress design provides additional off-road traction, abrasion and puncture resistance. Alternating 4-5 -rib tread pattern gives a bold look, while providing enhanced on- and off-road performance.