The Metzeler Six Days Extreme Hard 100/90-19 57M is a specialized rear enduro competition tire engineered for extreme hardpack terrain. Developed and tested in the FIM Enduro World Championship, it features a harder compound formulation that maximizes durability, stability, and resistance to chunking on rocky, compact surfaces. The reinforced polyester carcass ensures impact absorption and strength under racing conditions, while the optimized tread block design improves braking, traction, and cornering precision on hard terrain. Its directional tread pattern enhances rider control in technical sections, and the 57M load/speed rating guarantees consistent performance for enduro competition machines. Ideal for riders tackling hard enduro events, the Six Days Extreme Hard provides championship-winning grip and durability.