Modern motorcycle engines are getting stronger and stronger, and D.I.D continuously pursues improved chain designs to give riders the power they need. DID ZVMX series is focused o Rigidity. Increased rigidity means better power transfer from the engine to the ground, greater resistance to stretching under load and overall improved performance that meets the demands of current high-power bikes and the people who ride them. Connecting Links NOT interchangeable between the new 520ZVMX and the former 520ZVM2.