D.I.D ZVM-X Super Street Series 520 X 120 Link Motorcycle Chain520x120 D. I. Ds 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. Suitable for Bikes up to 1200cc in size requiring 520 chain 120 link and shorter. D. I. D