Born to win races - DID 520ERT3’s professional performance has been #1 among top factory SX and MX teams. D.I.D's exclusive SDH technology is not the only secret, the optimum balance between lightweight and strength brings you to the top of the podium. The D.I.D chain advantage isn’t just limited to light weight and superior strength, D.I.D’s exclusive SDH pin treatment is another secret behind their winning performance. The SDH pin treatment creates an extremely hard chromium carbide layer on the pin surface which increases chain life. And at the same time the pins inner core remains soft to absorb the tremendous shock loads of triple jumps without breaking.