DID Ert3 520 Gold 120-Link Racing Chain – High-Performance ERT3 with RJ Master Link

Racing-grade reliability with a smart design

The DID Ert3 chain is built for riders who demand responsiveness under pressure. With a premium gold finish and precision engineering, it pairs a hardened surface treatment with a softer inner core to absorb peak loads without adding unnecessary weight. In performance testing, the Ert3 shows 25% greater anti-shock performance and a 5% boost in tensile strength relative to the previous Ert2 generation, all while keeping the weight in check for nimble handling.

Smart engineering that you can feel

The exclusive SDH pin treatment creates a chromium carbide layer on the pin surface, delivering strong wear resistance at the critical joint. The inner core remains comparatively soft, helping to dissipate shock and keep engagement smooth under demanding riding conditions. The result is dependable power transfer even when you push the pace.

• 25% better anti-shock performance
• 5% higher tensile strength than Ert2
• Hardened SDH pin with chromium carbide surface

Durability meets precision

Cold-formed solid bushings contribute to high wear resistance and a seamless surface with complete roundness. This combination supports long service life and consistent engagement across the chain's life, which can translate to steadier shifting and smoother acceleration.

• Cold-formed solid bushings for durability
• Uniform roundness for precise alignment
• Long wear life under high-load use

Specs you can reference at a glance

Pin length: 17.6 mm; pin diameter: 5.34 mm; plate thickness: 2.0 mm (both sides). Weight: 1.36 kg per 100 links. Tensile strength: 37.0 kN (8,300 lbs). Includes a clip-style RJ master link for fast installation.

Real-world benefits for riders

Whether you’re powering through a racetrack sprint, navigating aggressive corner exits, or climbing steep grades, the Ert3 is designed to maintain smooth power delivery and reliable chain life. The gold finish adds a premium look to your drivetrain, while engineered geometry supports consistent engagement and optimized shifting under load.

Notes on installation and care: The Ert3 is optimized for 120-link configurations and requires proper chain tension and derailleur alignment for smooth operation. Regular cleaning and light lubrication help preserve the chromium carbide surface and bushings for longer life.