Road Racing D.I.D's 520ERV7 is the chosen chain of road racing teams in MotoGP, WSBK, MotoAmerica, and used by incredible talents, such as Valentino Rossi, Andrea Dovizioso, and Alex Rins. Upgraded For 2020 Upgraded from the 520ERV3, the 520ERV7 boasts a 3% higher tensile strength, a 13% longer chain life, and less friction due to X-Ring material improvements. Built for Professionals D.I.D's top-of-the-line racing chain can be found on the bikes of Ricky Brabec for rally, Josh Strang for GNCC, and Ken Roczen for SX/MX.