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