DID is the leading OEM with almost 70% of all Japanese motorcycles and many European brands. Leading racing teams in road and off-road sports rely on DID technology. DID ERV3: The ERV3 has been specially developed for racing and, despite the X-ring seals, is characterized by a very low weight of only 15.00 g / limb. For this reason, it is used among numerous racing teams, eg Yamaha in MotoGP. For both road and off-road racing, DID recommends use up to a maximum of 750cc. - very low weight - low friction losses due to patented X-ring technology - Gold-colored inner and outer lids (G & G = Gold and Gold)