DID 520 ERV7 - Drive Chain - 120 Links546076856 Product Description The 520 ERV7 chain boasts a 3% higher tensile strength due to stronger inner side plates and thicker pins Due to increased X Ring durability, the ERV7 sees a 13% wear resistance increase 520ERV7 is the top of the line racing chain for all types of motorcycle racing, on and off road Incredible design and utilization of D. I. D's patented X Ring seal technology makes the ERV7 a top performing racing chain available Utilized
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