EK Chain 520 RRX Gold/Gold NX-Ring Drive Chain – Open with Rivet Link, 84 to 146 Links

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