DID is an OEM of many Japanese and European brands. Leading racing teams in the Road and off-road sports rely on the technology of DID. DID 525VX: The successor to the tried and tested 525VM is also based on the long - Experience of DID in the MotoGP and fulfills the highest demands through the use of the patented X-rings. Compared to its predecessor, the 525VX has a much higher tensile strength and running performance. - high durability and low friction due to patented X-ring black outer pockets, black inner pockets