- "ARMOR-TEK3" Carcass Protection provides 50% more protection against impact damage than standard 2-ply tires. - The inner tread ribs alternating 3-2 pattern provides a number of significant performance benefits like: reduced road noise, increased stability and handling, superior soft surface (trail) and mud traction. - The "flex groove" provides a smoother ride by helping to dampen the impact generated by inconsistencies in pavement, potholes and gravel. - The Discoverer STT PRO features large, specially-designed cleats of rubber (side biters) on the shoulder area of the sidewall, to enhance traction and grip. - The asymmetrical scallops on alternating lugs direct mud into the mud scoops to allow the tire to pull through muddy terrains with ease.