DID 520 ERT3 Racing Motorcycle Chain — Gold 120-Link, High Tensile 37 kN, Lightweight

The DID 520ERT3-120 is a 120-link, gold-finish high-performance ERT3 racing chain engineered for improved shock resistance and greater tensile strength without added weight.

This motorcycle chain is built for riders who want a lightweight, durable drivetrain component that handles sudden loads and prolonged wear. The ERT3 design blends an advanced pin hardening process, precision bushings, and balanced plate geometry to extend service life and maintain smooth power transfer. It ships with a clip-style (RJ) master link and is sized for 520 applications at 120 links with measurable specifications for pins, plates, and tensile rating.

How does the ERT3 chain improve shock resistance during aggressive riding?

The ERT3 uses a selective hardening method on the pin surface that produces a very hard outer layer while keeping the core slightly softer. That combination disperses and absorbs impact forces instead of transferring them directly to plates and sprockets, reducing the chance of sudden failure under heavy load.

• SDH-treated pins with a chromium-carbide-like surface
• Soft inner pin core to dampen shock
• Cold-formed solid bushings for consistent load distribution

What are the durability and wear advantages compared to previous generation chains?

The ERT3 improves on earlier Ert2 designs by increasing tensile strength and anti-shock capability without adding mass. Precision plate thickness and fully rounded bushings reduce uneven wear, while the cold-forming process creates a smoother bushing surface for less friction and longer life.

• Approximately 5% higher tensile strength (37.0 kN rating)
• Cold-formed bushings for superior wear resistance
• Uniform plate thickness and roundness for even contact

What are the key specifications and what do they mean for fit and performance?

This chain is a standard 520 pitch with specific pin and plate dimensions chosen to balance strength and flexibility. The listed tensile rating and weight give a practical sense of how the chain will behave on performance bikes—strong enough for racing loads while remaining reasonably light for responsive handling.

• Length: 120 links (includes RJ clip-style master link)
• Pin length: 17.6 mm; pin diameter: 5.34 mm
• Plate thickness: 2.0 mm inner and outer; tensile strength: 37.0 kN
• Weight: 1.36 kg per 100 links (approx. 2.99 lbs per 100 links)

How should I install and maintain this racing chain for best results?

Installation follows standard 520 chain procedures—measure and cut to the correct number of links, fit the RJ clip-style master link securely, and ensure proper tension and alignment. Regular cleaning and lubrication tailored to your riding conditions will preserve wear life and consistent performance.

• Fit with correct sprocket alignment and tension per manufacturer specs
• Use chain lube after cleaning—re-lubricate after wet or dusty rides
• Inspect pins and bushings for wear, and replace before excessive elongation

Who is this for: The DID 520ERT3-120 is aimed at sport and race riders who demand a robust, lightweight chain that tolerates high-impact loads and long-term use. It’s a strong choice for track days, spirited street riding, and upgrades where longevity and shock resistance matter. If you run a 520 setup and want a premium chain with advanced pin treatment and cold-formed bushing technology, this ERT3 model offers a clear performance-oriented upgrade.