RK CHAIN RK420MXZ GG 78C GB420MXZ-78-CLAll RK chains are pre stressed and pre stretched to ensure equal load distribution and minimal maintenance , They're made of the highest grade medium carbon alloy steel available, with all components shot peened and heat treated, Made for the serious motocross racer , Feature chromoly steel construction with seamless rollers and bushings, and oversized alloy pins for added strength , Chain includes clip connecting link
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