RK · Part
The RK 420 MRU Chain is a lightweight, low-friction, sealed 420 pitch chain that uses RK’s proprietary Ultra Thin Seal U-Rings. This U-Ring design allows the seal thickness to be less than 50% of the most common O-ring seal, helping deliver a smooth, efficient feel.
MRU is described as offering 4 times longer chain life and requiring fewer chain adjustments than comparable non-sealed 420 chains. It is listed as a 420 pitch chain suited for Honda® Monkey and Honda® Grom. Choose from the available Black chain options in 120 Links or 130 Links (see options and part descriptions for details).
MRU chains use RK’s proprietary Ultra Thin Seal U-Rings. RK states this seal design allows the seal thickness to be less than 50% of the most common O-ring seal. The result is a sealed chain design that focuses on keeping friction low while maintaining the characteristics of a U-Ring sealed setup.
RK notes that MRU features 4 times longer chain life and will require less chain adjustments than comparable non-sealed 420 chains. This makes the 420 MRU a practical choice for riders who want a sealed 420 pitch chain that is intended to stay consistent over time.
MRU chains utilize RK's proprietary Ultra Thin Seal U-Rings which allows the thickness of the seal to be less than 50% of the most common O-ring seal.
The RK 420 MRU Chain is offered in two Black configurations: 120 Links and 130 Links. Link count determines overall chain length, so selecting the correct option depends on the chain length requirement for the application. Refer to the option names and the part descriptions shown on the page to confirm the link count associated with each selection before ordering.
| MRU chains utilize RK's proprietary Ultra Thin Seal U-Rings which allows the thickness of the seal to be less than 50% of the most common O-ring seal. |
| MRU features 4 times longer chain life and will require less chain adjustments than comparable non-sealed 420 chains. |
| Lightweight, low friction, sealed, U-Ring 420 pitch chain perfect for Honda® Monkey and Honda® Grom. |
As listed for this part in RK's product information.
