The Discoverer STT PRO is the most extreme all-season, off-road tire Cooper offers to date, providing remarkable off-road performance without sacrificing on-road traction.<p> Unique hybrid 3-2 tread pattern reduces noise and increases stability.<p> Alternating shoulder lugs enhance traction in mud and soft surfaces.<p> Anti stone retention resists stone retention which helps to increase the life of the tire.<p> Mud release dimples aid in keeping the read pattern free of loose soil.