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D.I.D's engineers are continuously improving chain designs in order to handle tremendous horse power loads of today's high performance motorcycles. In developing the new DID ZVM-X Series, they focused on rigidity. Traditionally, tensile strength has been the bench-mark to indicate overall strength, but tensile strength is only a laboratory static measurement of a chain's fracture point. Rigidity, on the other hand, is the ability of a chain to withstand the forces that occur in the real world that rider experience. 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 our current high-power bikes and the people who ride them.