DID 525VX X-Ring Chain for BMW F750 GSDID 525VX X Ring Chain for BMW F750 GS DID 525VX X Ring Chain Created to withstand the severe demands of todays top World Superbikes, DID is proud to introduce the high performance DID VX Series Chain. In developing it, DID focused on improving rigidity. Traditionally, tensile strength has been used to indicate the overall strength of a chain, but tensile strength is only a laboratory static measurement of a chains breaking point. Rigidity, on the