EK Chain 520 R/3D NX-Ring Chain Chrome – Open with Rivet Link, 110 to 120 Links

If you are chasing every last fraction of a second at the track, the chain you choose matters more than most riders realise. The EK 520 R/3D NX-Ring chain in chrome is one of the lightest options in EK's ThreeD series, trusted by the MOTO2 Stylobike Yamaha Racing Team and purpose-built for 600 cc to 750 cc supersport machinery where rotating mass is the enemy of lap times.

Key Features

• Weighs just 1.44 kg per 100 links — a genuine reduction in unsprung and rotating mass that pays dividends in acceleration and throttle response
• NX-Ring seal technology delivers an optimal balance of low friction and long service life, with a relative service life rating of 3400 per 100 links
• R/3D construction combines cold-forged inner and outer plates with drilled, lightened pins for maximum strength without unnecessary weight
• Chamfered inner and outer plates reduce drag and ease sprocket engagement for cleaner power delivery
• Supplied open with a rivet master link (MLJ) — the preferred fitment in professional racing for its superior clamping force and resistance to shock loading
• Chrome finish provides a premium, corrosion-resistant look that holds up under the demands of track use
• Available from 110 to 120 links in 520 pitch, covering a wide range of supersport and race-spec fitments

NX-Ring Technology Explained

The NX-Ring is EK's proprietary sealing solution, shaped to minimise contact area between the ring and the side plates. This reduces internal friction compared with conventional O-ring designs, meaning more of the engine's power actually reaches the rear tyre. At the same time, the ring maintains adequate lubrication retention so the chain does not wear prematurely even under the thermal and mechanical stress of track use. The result is a chain that feels noticeably more alive under acceleration and holds its efficiency rating for longer than standard sealed chains.

R/3D Construction

The R/3D designation refers to EK's three-dimensional lightening process applied throughout the chain. Cold-forged link plates are stronger than cast equivalents at the same weight, and the chamfered edges on both inner and outer plates reduce stress concentration at the highest-load points of each link. The pins are drilled to remove mass where it has the least structural impact. Together these features contribute to the 1.44 kg per 100 links figure and a 35 kN tensile strength rating — numbers that reflect a chain designed for race conditions, not just race aesthetics.

Chrome Finish

This variant is available exclusively in chrome, giving the chain a clean, high-contrast appearance that reads well against the sprockets and swingarm. The finish also provides an additional layer of protection against the moisture, grit and oil contamination that are unavoidable on a circuit or in a paddock environment.

Fitment and Compatibility

The EK 520 R/3D NX-Ring chain is sized in 520 pitch and is suited to the following applications, among others:

• MOTO2 racing machines
• Yamaha R6, R7
• Kawasaki ZX-6R, ZX-4 RR
• Honda CBR 600 RR
• Triumph Daytona 675, Daytona 675 R, Street Triple 765 R, Street Triple 765 RS
• Ducati 848, 899, 959, 1199, 1199 S, 1199 R, 1299, 1299 S
• Aprilia RSV4, RSV4 R, RSV4 RR, RSV4 RF, RSV4 1100, RSV4 1100 Factory, RS 660, RS 457
• BMW S1000RR, M1000RR, HP4, HP4R
• KTM RC 390, RC8 1190
• MV Agusta F3, F4
• Suzuki GSX-R 600, GSX-R 750, GSX-R 1000
• ST600 class race bikes

Always verify the correct link count and pitch against your specific model's sprocket configuration before ordering. Available in 110, 112, 114, 116, 118 and 120 link lengths.

Specifications

• Chain pitch: 520
• Link count options: 110 – 120 (your choice)
• Weight: 1.44 kg per 100 links
• Relative service life: 3400 per 100 links
• Seal type: NX-Ring
• Intended use: track
• Colour: chrome
• Master link: rivet link (MLJ)
• Chain type: R/3D
• Manufacturer: EK Chain