The facts.
| Chain pitch | 520 |
|---|---|
| Number of links | 84- 146 (selectable) |
| Weight (kg/100 links) | 1,56 kg |
| Relative service life (per 100 links) | 3500 |
| Seal type | NX-Ring |
| Application | Track |
| Colour | Gold/Gold |
| Master link | Rivet link |
| Chain type (EK) | RRX |
| Manufacturer | EK Chain |
DescriptionThe whole story▼
When every lap demands the same from your drivetrain as the last, the EK 520 RRX NX-Ring chain in Gold/Gold delivers the sustained, all-day confidence that serious track riders depend on. Proven in the JSB1000, Suzuka 8 Hours, ST600, and J-GP racing series, this is a chain engineered to feel as composed in the closing stages of a long track session as it does on the warm-up lap.
Key Features
- NX-Ring seal technology minimises internal friction and maintains consistent lubrication throughout extended running, reducing power loss and keeping the drivetrain smooth session after session.
- Tensile strength of 37.8 kN (8,500 lbs) provides a wide safety margin under hard acceleration and extreme load cycles without adding unnecessary mass.
- Optimised weight of 1.56 kg per 100 links keeps rotating mass to a minimum, sharpening throttle response and reducing drivetrain inertia on track.
- Rivet-link connection — the preferred closure in professional racing — offers maximum joint security and eliminates the weak point associated with clip-type master links.
- Gold/Gold finish gives the chain its distinctive race-bred appearance while also providing an extra layer of corrosion resistance.
- Available in link counts from 84 to 146, making this a single solution for a wide range of 520-pitch fitments and custom gearing configurations.
NX-Ring Technology: Efficiency Over the Long Run
The NX-Ring is EK Chain's precision-shaped seal, designed to reduce contact area between inner and outer plates while retaining grease deep within the pin-and-bushing interface. Compared to conventional O-ring chains, the result is measurably lower friction, a relative service life rating of 3500, and a drivetrain that holds its efficiency long after a standard chain would have begun to stretch and wear. For riders who push hard over full track days or multi-race weekends, that consistency matters as much as outright peak performance.
Tensile Strength and Rivet-Link Security
At 37.8 kN (8,500 lbs) the RRX chain handles the shock loads generated by a high-powered 520-pitch application without compromise. The chain is supplied open — ready for custom link-count fitting — with a rivet-type master link included. Riveting the link rather than clipping it produces a joint that matches the strength of the chain's side plates, which is why every professional team running EK chain in circuit racing specifies this closure method. Proper rivet-link installation requires a chain breaker and rivet tool; always follow the manufacturer's installation guidelines.
Weight and Rotating Mass
At 1.56 kg per 100 links, the 520 RRX sits at an excellent point on the strength-to-weight curve for a sealed racing chain. Lower rotating mass translates directly into sharper acceleration, more immediate engine-braking feel, and reduced stress on the sprocket carrier and wheel bearings — benefits that compound across the full duration of a track day rather than disappearing after the first corner.
Gold/Gold Finish
The all-gold plating on both inner and outer plates is not purely cosmetic. The surface treatment adds corrosion resistance across the full chain length, which is particularly useful in variable track-day conditions where chains are exposed to brake dust, tyre debris, and temperature cycling. On a polished wheel and anodised sprocket combination, the Gold/Gold finish also presents a clean, purposeful track aesthetic.
Fitment and Compatibility
The EK 520 RRX is compatible with any motorcycle running a 520-pitch drivetrain. The tag list covers an extensive range of machines from the following manufacturers and model families:
- Aprilia: RSV4, RSV4 R, RSV4 RR, RSV4 RF, RSV4 1100, RSV4 1100 Factory, RS 660, RS 457
- BMW: S1000RR, M1000RR, HP4, HP4R
- Bimota: KB998 Rimini
- CFMOTO: 450 SR, 675 SR-R
- Ducati: 848, 899, 959, 1199, 1199 S, 1199 R, 1299, 1299 S, V2, V2 S, V4, V4 S, V4 R
- Honda: CBR 600 RR, CBR 1000 RR, CBR 1000 RR-R
- KTM: RC 390, RC8 1190, 990 RC R
- Kawasaki: ZX-4 RR, ZX-6R, ZX-10 R, ZX-10 RR, Ninja 400
- MV Agusta: F3, F4
- QJMotor: SKR 800 RR
- Suzuki: GSX-R 600, GSX-R 750, GSX-R 1000
- Triumph: Daytona 675, Daytona 675 R, Daytona 765, Daytona 765 Moto 2, Street Triple 765 R, Street Triple 765 RS
- Voge: V2 890, V2 S 890, V2 955
- Yamaha: R1, R1M, R3, R6, R7, R9
Always verify the required link count and pitch for your specific model and year before ordering. A 520-conversion sprocket set may be required on models that left the factory with a wider-pitch chain.
Specifications
| Specification | Detail |
|---|---|
| Chain pitch | 520 |
| Link count | 84–146 (selectable) |
| Weight per 100 links | 1.56 kg |
| Relative service life (per 100 links) | 3500 |
| Seal type | NX-Ring |
| Application | Track |
| Colour | Gold/Gold |
| Master link | Rivet link |
| Chain type | RRX |
| Manufacturer | EK Chain |
What's includedEverything in the box▼
- 1x Chain
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
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