DID is original equipment manufacturer to leading Japanese and European motorcycle brands. Motorcycle racing teams worldwide rely on the superior technology of Daido Kogyo Ltd. 
 
 The development of the successor to the proven 520ERV3 is also based on the longstanding 
 DID has experience in MotoGP and meets even the highest demands through the use of the patented X-rings. 
 
 - ERV7 was specially developed for racing 
 - longer service life and lower friction thanks to the patented X-rings 
 - by means of direct power transmission technology, the driver gets an incredible acceleration response when accepting the throttle. This is due to the state-of-the-art technology to increase the chain strength