D.I.D.'s exclusive SDH pin treatment is the secret behind the superior performance of 520ERT2 race chain. SDH hi-tech pin treatment forms an extremely hard chromium carbide layer on the pins surface while maintaining a soft inner core. SDH pins have extreme impact strength while maintaining outstanding shock absorption. D.I.D.'s new ERT2 is one of the lightest and strongest chains on the market.

D.I.D.'s patented X'ring construction reduces friction by twisting between the side plates instead of being squashed. Normal O'rings and other maker's modified O'rings have squashed points that increase friction. The twisting action of the X'ring disperses the pressure and minimizes power loss. D.I.D. has redesigned the shape of the X'ring to maximize wear resistance of the 520ZVM2, 525ZVM2 and 530ZVM2 chains. Super Street X2-Ring chains have also been beefed up in tensile strength to make them the ultimate chains for today's high performance sport and sport touring motorcycles.