DID is an OEM of many Japanese and European brands. Leading racing teams in the Road and off-road sports rely on the technology of DID. DID ZVM-X: As a successor to the proven high - performance chain ZVM2, ZVM-X is particularly suited to the various loads encountered in everyday life. In this case, the tensile strength only indicates the fracture load of a chain determined statically in the laboratory, but not the resistance to the forces occurring in practice. Therefore the ZVM-X focused primarily on the strength in the application. an increased tensile strength and -lower weight compared to ZVM2 - very high wear resistance and - up to 50% reduced friction losses due to the patented X-ring technology Gold-colored outer pockets, gold-colored inner pockets (G & G = gold and gold).