The D.I.D. 520ERT2 chain is used by the top factory Supercross and Motocross teams. The secret behind the superior performance of the 520ERT2 is D.I.D’s exclusive SDH pin treatment. SDH treated pins have extreme impact strength while maintaining outstanding shock absorption. This treatment creates a chain with anti-oxidation properties and superior wear resistance against invasion of hard foreign materials.

Features:

• Gold colour plates
• Solid rollers
• Shot-peened parts
• High cylindrical and roundness accuracy
• Exacting tolerances provide low friction
• Pre-stretched
• Extended riveted bushing "Anti-Kink" design
• Special alloy steel
• Recommended for Supercross or Motocross race bikes up to 250cc
• Weight: 1790g
• 120 Links
• Height: 27mm
• Pin Length: 17.60mm
• Plate Thickness: 2.0mm  

"DID tried to build a chain that is as light as possible but strong enough to handle the load of the specific bike application. This is why there are three models of non O-ring chains. THe 520ERT2 is the preferred chain for motocross racing. It’s used by James Stewart, Chad Reed, Ryan Dungey, Ryan Villopoto and many of the top racers. The chain has been upgraded over the years, and the latest generation is 5 percent lighter." - DID’s Robert Palmer.