Description
D.I.D 520ERT3 Gold Motocross Chain — 120 Links
Lightweight, Race-Proven Performance for 125cc–450cc Motocross Bikes
The D.I.D 520ERT3 Gold Motocross Chain is a premium non-sealed racing chain engineered for riders who demand low weight, responsive power delivery and exceptional strength.
After testing many chains over more than 25 years, MSV Racing continues to trust D.I.D for its manufacturing quality, consistency and durability. Made in Japan and developed specifically for motocross competition, the 520ERT3 combines an 8,300-pound tensile-strength rating with improved resistance to sudden shock loads.
Product Highlights
- Premium 520 non-sealed motocross chain
- Supplied with 120 links
- Recommended for motocross motorcycles up to 450cc
- Rated tensile strength of 8,300 pounds
- Approximately 25% greater anti-shock performance than the previous model
- Lightweight construction for responsive power delivery
- Gold inner and outer link plates
- Designed for motocross, supercross and closed-course competition
- Used at the highest levels of professional motorcycle racing
- Manufactured in Japan by D.I.D
- Ideal for serious racers and performance-focused riders
Built for Motocross Performance
The D.I.D 520ERT3 is designed for racing environments where low rotating weight and immediate throttle response are priorities.
Unlike an O-ring or X-ring chain, the 520ERT3 does not use sealing rings between the link plates. This reduces friction and weight, allowing engine power to transfer efficiently to the rear wheel.
Its non-sealed construction makes it especially well suited for:
- Motocross
- Supercross
- Closed-course racing
- Off-road competition
- Performance-focused dirt-bike builds
- Riders who clean and lubricate their chains regularly
High Tensile Strength and Improved Shock Resistance
Motocross chains must withstand repeated acceleration, hard landings, rapid gear changes and sudden traction loads.
The 520ERT3 has a rated tensile strength of 8,300 pounds and provides approximately 25% greater anti-shock performance than the preceding ERT-series design.
This helps the chain resist the abrupt loads commonly created by:
- Hard race starts
- Jump landings
- Aggressive clutch use
- Sudden traction changes
- High-output four-stroke engines
- Powerful two-stroke race bikes
Lightweight, Non-Sealed Racing Design
The absence of sealing rings reduces friction and keeps chain weight low. A 100-link section weighs approximately 2.99 pounds, helping minimize rotating mass without sacrificing strength.
Potential performance benefits include:
- Quicker throttle response
- Efficient power transfer
- Lower drivetrain drag
- Reduced rotating weight
- Responsive acceleration
Because it is a non-sealed racing chain, regular cleaning, inspection and lubrication are essential for maximum service life.
Gold Inner and Outer Links
The D.I.D 520ERT3 features gold-colored inner and outer link plates for a premium factory-race appearance.
Beyond its distinctive finish, the chain is manufactured using D.I.D’s precision production standards for consistent link movement, accurate dimensions and dependable racing performance.
Chain Specifications
| Specification | D.I.D 520ERT3 |
|---|---|
| Chain size | 520 |
| Supplied length | 120 links |
| Maximum recommended displacement | 450cc |
| Tensile strength | 8,300 lb |
| Weight per 100 links | 2.99 lb |
| Seal type | Non-sealed |
| Chain Life Index | 410 |
| Pin length | 0.693 in. |
| Pin diameter | 0.210 in. |
| Inner plate thickness | 2 mm |
| Outer plate thickness | 2 mm |
| Link finish | Gold inner and outer |
| Country of manufacture | Japan |
Fitment and Sizing Information
This chain is supplied with 120 links and may need to be shortened for your motorcycle and gearing combination.
Correct chain length depends on:
- Motorcycle model
- Front-sprocket size
- Rear-sprocket size
- Swingarm position
- Wheelbase adjustment
Always verify the required chain length before removing links. Use an appropriate chain tool and install the supplied or manufacturer-approved connecting link according to D.I.D instructions.
Important Maintenance Information
The 520ERT3 is a performance-oriented, non-sealed chain. It requires more frequent maintenance than an O-ring or X-ring chain.
For best results:
- Clean the chain after riding
- Lubricate it frequently
- Check chain tension before every ride
- Inspect the sprockets for wear
- Replace worn chains and sprockets together
- Avoid overtightening
- Confirm the connecting link is installed correctly
Riders seeking longer service intervals for trail, dual-sport or recreational riding may prefer a sealed D.I.D chain.
Why MSV Racing Recommends D.I.D
D.I.D chains have been trusted in professional motocross and motorcycle racing for decades. The 520ERT3 delivers the combination serious competitors need:
- Low weight
- High tensile strength
- Excellent shock resistance
- Minimal drivetrain drag
- Consistent manufacturing quality
- Race-proven performance
For riders who prioritize maximum motocross performance over extended maintenance intervals, the D.I.D 520ERT3 remains one of the strongest non-sealed 520 racing chains available.
Upgrade Your Drivetrain
Give your motocross bike a lightweight, durable and responsive racing chain with the D.I.D 520ERT3 Gold 520 Chain in 120 links.
Race-proven strength. Lightweight performance. Made in Japan.
Fitment