RK 420MRU U-Ring Chain

Upgrade your small-displacement motorcycle with the RK 420MRU U-Ring Chain - featuring revolutionary Ultra-Thin Seal technology that delivers up to 4 times longer chain life than non-sealed equivalents with minimal weight increase. Trusted by OEM manufacturers and professional race teams worldwide, this premium chain brings championship-proven quality to riders across New Zealand.

Revolutionary Ultra-Thin Seal Technology

The RK 420MRU features Ultra-Thin Seal technology where the seal thickness is less than 50% of common seals. This breakthrough design makes it possible to create a sealed chain with the weight of a non-sealed chain, delivering exceptional longevity without the weight penalty. You can expect up to 4 times longer chain life than a non-sealed 420 equivalent chain.

Championship-Proven Quality

Since 1953, RK Takasago has been synonymous with quality, researching and developing high-performance sealed-ring chains for over thirty years. RK is the trusted supplier for OEM manufacturers including Honda, Yamaha, Suzuki, and Kawasaki. RK chains are used by professional race teams worldwide including MotoGP Repsol Honda, WSBK Kawasaki Racing Team, and many more.

Premium Construction

All RK sealed chains feature heat-treated hi-carbon alloy steel components, delivering unrivalled wear life. Seamless rollers allow the chain to run freely between the teeth of the sprocket and reduce chain vibration. All RK seals are made from an advanced Nitrile Butadiene composite for maximum performance and wear life.

Key Features

• 420 pitch - ideal for small-displacement motorcycles
• Ultra-Thin Seal technology - less than 50% thickness of common seals
• Up to 4 times longer chain life than non-sealed 420 chains
• Minimal to no weight increase over non-sealed chains
• Heat-treated hi-carbon alloy steel components
• Seamless rollers for smooth operation and reduced vibration
• Advanced Nitrile Butadiene composite seals
• Clip-type master link included
• OEM quality trusted by Honda, Yamaha, Suzuki, and Kawasaki

Technical Specifications

• Pitch: 420
• Chain Length: 106 links
• Weight: 0.79 kg
• Maximum CC Rating: 150cc street
• Master Link Type: Clip
• Seal Type: U-Ring with Ultra-Thin Seal technology

Available Link Lengths

• 106 Links
• 120 Links
• 130 Links

Perfect For

• Small-displacement street motorcycles up to 150cc
• Riders seeking maximum chain longevity
• Applications where weight is a concern
• Commuters and daily riders in New Zealand
• Anyone wanting OEM quality at competitive pricing

Why Choose RK?

RK Takasago has been producing motorcycle chains since 1953, with over thirty years of experience in high-performance sealed-ring chain development. As the trusted supplier for major OEM manufacturers and professional race teams worldwide, RK delivers championship-proven quality and reliability for everyday riders.

Performance Benefits

The Ultra-Thin Seal design provides the best of both worlds - the extended life and protection of a sealed chain with the lightweight performance of a non-sealed chain. This means better acceleration, reduced unsprung weight, and significantly longer service intervals compared to traditional non-sealed chains.

Fast shipping across New Zealand. Upgrade to RK 420MRU quality and experience championship-proven performance.