NITTO RIDGE GRAPPLERFeatures Variable pitch tread pattern Alternating shoulder grooves Lateral Z grooves Coupling end points Reinforced block foundation Stone ejectors Staggered shoulder lugs Alternating tapered edges Step block edges Benefits Provides a quiet and smooth highway ride Help clear mud and maintain traction To provide biting edges for traction Strengthens the block edge to reduce irregular wear Adds rigidity to tread blocks to reduce flex Protects the bottom