D.I.D ERT3 Non O-Ring Gold Chain 520
MSRP: $115.95
$92.76
Exact Fitment Guarantee
The D.I.D 520 ERT3 Non O-Ring Gold Chain is the premier lightweight competition drive chain engineered specifically for world-class Supercross, AMA Pro Motocross, and high-performance closed-course racing. Replacing heavy, drag-inducing sealed chains or low-grade OEM non-sealed chains, the ERT3 is optimized to deliver maximum horsepower transfer to the rear wheel with the lowest possible rotating inertia and frictional resistance. D.I.D is the factory chain choice for elite teams worldwide, and the ERT3 represents their highest non-sealed racing specification.
The ERT3 features D.I.D's patented Solid Bushing technology and proprietary SDH (Super-Dai-Hard) high-tech pin treatment. The pins undergo an advanced chromium carbide surface hardening process that produces an extremely hard exterior layer while maintaining a soft, shock-absorbing inner core. This delivers immense tensile strength (rated at 8,300 lbs) and a 25% increase in anti-wear elongation lifespan compared to previous-generation ERT2 chains. The outer plates are finished in radiant gold plating, while the inner plates are shot-peened natural steel, offering superior corrosion resistance and professional factory aesthetics.
- Chain Pitch: 520 Pitch (Standard 5/8" pitch x 1/4" roller width)
- Chain Type: Non O-Ring competition race chain (Zero seal drag)
- Tensile Strength: 8,300 lbs (37.0 kN) maximum tensile rating
- Pin Treatment: SDH (Super-Dai-Hard) chromium carbide surface hardening
- Plating: Gold outer link plates with shot-peened natural inner links
### Step-by-Step Installation & Safety Protocols Installation requires a 520 chain breaker tool and a master link press tool. Count and trim the chain to the exact link count matching your sprocket combination and swingarm wheelbase setting. Route the chain over the countershaft sprocket and rear sprocket. Apply quality chain assembly lubricant to the included clip-type master link pins and side plate. Press the side plate onto the pins using a master link press tool until the clip grooves are fully exposed. Install the spring clip with the closed, rounded end facing the direction of forward chain rotation (this prevents trail debris from unseating the clip). Adjust chain slack to factory swingarm specifications (typically 50-58mm measured from swingarm slider to chain center).
### Maintenance & Lubrication Protocol Maintenance for a non O-ring race chain requires cleaning with a chain brush and dedicated cleaner after every moto wash, drying thoroughly with compressed air, and applying high-performance non-fling chain lubricant before each session.
Frequently Asked Questions
Q: Why do Supercross and Motocross racers choose non O-ring chains like the ERT3?
A: Non O-ring chains have zero internal rubber seal friction and significantly lower rotating mass, ensuring that every available fraction of engine horsepower reaches the rear tire for maximum acceleration out of the gate.
Q: Which way should the master link clip be installed?
A: The closed, solid end of the master link clip must always face the direction of forward chain rotation. If the open end faces forward, contact with the chain guide or track debris can knock the clip off.
Q: How often should I clean and lube the D.I.D ERT3 chain?
A: Because it does not have internal O-ring grease reservoirs, the ERT3 should be thoroughly cleaned, dried, and lubricated after every single ride or wash to prevent premature wear and rust.
Q: What is the maximum engine displacement recommended for the ERT3?
A: The D.I.D 520 ERT3 is rated for competition motocross machines up to 450cc four-strokes.