D.I.D. 520ERV7100ZB 520ERV7 Gold X-Ring Racing Chain 100 Links

The D.I.D. 520ERV7 is D.I.D.'s flagship top-of-the-line X-Ring racing chain, engineered for all types of motorcycle racing both on and off road. Rated for engines up to 1,000cc, the 520ERV7 delivers race-proven performance with a massive 8,800 lb. tensile strength and a full gold finish on both inner and outer plates. This 100-link chain ships with a rivet-type master link included.

The ERV7 is a significant advancement over its predecessor, the 520ERV3, featuring stronger inner side plates and thicker pins for a 3% increase in tensile strength, along with improved X-Ring seal materials that deliver a 13% longer chain service life. D.I.D.'s patented X-Ring seal design reduces friction by twisting between the side plates rather than compressing flat — dispersing pressure across four contact points to minimize power loss while maximizing lubrication retention and dirt exclusion.

Key Features:

• 520 pitch: roller spacing 15.88mm, inner width 6.35mm, roller diameter 10.16mm
• Tensile strength: 8,800 lbs.
• Maximum engine displacement: 1,000cc
• Weight: 3.41 lbs. per 100 links
• Chain Life Index: 3,500
• Pin length: 0.752" | Pin diameter: 0.217"
• Inner and outer plate thickness: 2mm each
• Full gold finish — gold inner and outer plates and rollers
• Patented X-Ring seal technology for reduced friction and superior contamination resistance
• Rivet-type master link included (installation requires a chain riveting tool)
• 100 links
• Made in Japan

The 520ERV7 is the chain of choice for factory racing teams competing in MotoGP, World Superbike (WSBK), MotoAmerica, and off-road series including WORCS and NGPC. Compatible with all standard 520-pitch sprockets, this chain is ideal for track days, club racing, top-level competition, and high-performance street riding.