RK CHAIN RK420SB 138C 420SB-138-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, Heat treated medium carbon alloy steel construction , All components heat treated and shot peened for maximum strength , Two point pin riveting and solid rollers , For motorcycles that did not come with an O ring or heavy
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