RK MXZ 520 GOLD TRIALS CHAINLightest and Strongest Motocross chain Use by top MXGP & MX2 teams Ideal for trials like the Scott or SSDT where it is imperative to have a hard wearing chain that will not let you down during the event. RK 520MXZ5 applies the HCR Pin and special alloy steel for component making, resulting in a tensile strength as high as 35. 6[kN] with weight as light as 13. 7[g L]. RK 520MXZ5 features special alloy pins with RK special HCR Treatment (High Tech