The Cooper Discoverer S/T Maxx is designed for tough terrain, including rocks and gravel, with on-road stability and performance. It features a Hybrid 4-5 Rib design to provide low tread pattern noise and even wear, Dual-draft and Non-parallel groove walls that help reduce stone retention and resist cutting and chipping, and stone ejector ribs to help discharge debris and resist stone retention. Cooper Discoverer S/T Maxx tires now 25% off and ships free.