Cooper Discoverer A/T3 All-Terrain Radial Tire - LT285/75R17 121/118S MODERN, AGGRESSIVE 5-RIB ALL-TERRAIN DESIGN - The aggressive all terrain design is engineered to provide outstanding performance in both on-road and off-road driving applications: The A/T3 tread pattern exploits a combination of features specifically suited to provide solid all-terrain performance, superior all-season traction, excellent stability, confident handling and reliable tread wear SILICA BASED TREAD COMPOUND - The tread compound is formulated with a chemically coupled silica and carbon black mixture that provides excellent wet traction and handling on the highway, while also improving cut and chip resistance in more harsh rocky and gravel terrain: The silica enriched tread compound has lower rolling resistance than traditional full carbon black tread compounds MICRO GAUGE ZIG-ZAG SIPING - The smaller gauge sipes in the tread elements provide increased vehicle stability and control, while reducing the potential for stone retention and stone drilling: The zig-zag shape creates more biting edges which allow for better soft surface and wet traction COUPLED TREAD ELEMENTS - The center and intermediate tread elements are uniquely designed in pairs affording excellent stability and confident handling BROKEN CENTER RIB - The broken center rib improves soft surface traction without sacrificing handling