DID is original equipment manufacturer of many Japanese and European brands. Leading racing teams in the Road and off-road sports rely on DID technology. DID 520VX3: The development of the successor of the proven 520VX2 is also based on the long-standing Experiences of DID in the MotoGP and fulfilled by the use of the patented X-rings even highest claims. - longer life and lower friction thanks to the patented X-rings - By means of direct power transmission technology, the driver gets an incredible acceleration resonance in the throttle response This is due to the state-of-the-art technology for increasing chain strength.