Super Street X-Ring ZVMX Series Gold 520-110L 520ZVMXG-110L D.I.D’s Super Street Series X-Ring Chains were designed with increased power transfer from the engine to the ground, greater resistance to stretching under load and overall improved performance that meets the demands of current large displacement street bikes and the people who ride them. D.I.D's ZVM-X chains are the strongest high mileage chains.