The EK 520MXR 3D is a high-performance non-sealed racing chain built specifically for Motocross and Enduro competition. Engineered for riders who demand the best, it combines lightweight construction with exceptional durability through a range of advanced manufacturing techniques.  Rated at 38.5 kN tensile strength, the 520MXR 3D is compatible with bikes up to 500cc (4-stroke) and 250cc (2-stroke).