RK 420 MRU Sealed Chain, 130 Links, Black (BL420MRU-130)

The RK BL420MRU-130 420 MRU chain is a lightweight, sealed drive chain designed for compact motorcycles, including the Honda® Monkey and Honda® Grom. Its proprietary Ultra Thin Seal U-Ring design uses a seal that is less than half the thickness of many conventional O-ring seals, helping reduce friction while retaining effective protection against contaminants and lubricant loss. The black finish provides a clean, durable appearance for street and recreational applications.
The MRU series is engineered to deliver up to four times the chain life of comparable non-sealed 420 chains, helping reduce maintenance frequency and the need for repeated chain adjustments. Sealed construction helps preserve lubrication inside the chain’s working components, supporting consistent operation and improved durability during everyday riding. The 130-link configuration provides a practical replacement option for compatible 420-pitch motorcycle drivetrains and can be sized to suit the application when required.
Designed for riders seeking dependable performance without unnecessary weight, this RK chain combines low-friction operation, sealed protection, and long-wearing construction. Verify the motorcycle manufacturer’s fitment and required link count before installation. The RK BL420MRU-130 is a purpose-built replacement chain for compatible Honda® Monkey, Honda® Grom, and other applications using a 420-pitch drivetrain.

Features:

• Brand: RK

• Part Number: BL420MRU-130

• Chain Type: 420 MRU sealed U-Ring chain

• Link Count: 130 links

• Finish: Black

• Seal Design: Proprietary Ultra Thin Seal U-Rings

• Performance: Up to four times longer chain life than comparable non-sealed 420 chains

• Maintenance: Requires fewer chain adjustments than comparable non-sealed 420 chains

• Construction: Lightweight, low-friction, sealed design

• Compatibility: Suitable for compatible Honda® Monkey and Honda® Grom applications

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