Tire - MC360* Mid-Hard - R Spec - Front - 80/100-21 - 51M Alternated-cut knobs add to the balance of lateral and longitudinal stiffness, which maximizes grip for traction and braking and provide outstanding durability, Features Metzeler*s CKB design (Continuous Knob Binding) with dense, narrow knobs that dig into soft terrain and an extended footprint on hard terrain, Provides superior grip in an incredibly wide variety of terrain, adds braking stability and boosts tearing resistance on mid-hard and hard terrains, Parabola-shaped center elements: the center of the knob digs, the sides withstand the stress and enlarge the tire*s footprint, Alternated diamond-shaped and shovel-shaped lateral knobs for optimal directionality and steering feel, Reversible tread pattern, NHS (Not for highway service).