Super Street X-Ring ZVMX Series Natural 520-100L 520ZVMX-100L 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.