RK Racing Chain GB420MXZ126 126-Links Gold MX Chain - Lightweight

Our review of the RK Racing Chain GB420MXZ126 finds a focused, no-nonsense replacement chain for minibikes and smaller motocross machines where strength, fit, and appearance matter. The single biggest reason to buy is its combination of lightweight chromoly construction and a verified tensile strength of 5000 pounds per ft, which delivers a durable ride without excessive weight. Riders looking for a direct-fit, visually appealing gold chain with solid build quality will appreciate what this chain offers compared with typical stock grom chains.

Key Features

• Chromoly steel construction: Provides a strong yet light link and roller structure that helps reduce unsprung mass while maintaining durability.
• Seamless rollers and bushings: Smooth contact points that improve chain life and reduce noise under normal riding conditions.
• Oversized special alloy pins: Offer extra shear resistance, which contributes to the chain's overall tensile strength and real-world durability.
• HIT heat treatment: All components are heat-treated with RK's HIT process for consistent hardness and improved wear resistance.
• 126-link length with connecting link: Arrives ready to size and install, making it suitable for common minibike and small MX sprocket combinations.

Who It's For

The GB420MXZ126 is aimed at riders of small-displacement motocross and pit bikes who want a lightweight, high-strength chain that also improves the bike's appearance. It is a good pick for anyone replacing worn stock chains on machines like small Honda CRF models where a precise fit and dependable strength are priorities.

Those who need extremely heavy-duty industrial drive chains or a different pitch/length should look elsewhere, as this chain is positioned for motorcycle and powersports drive trains rather than larger commercial applications.

Pros & Cons

Pros

• Solid build quality from chromoly steel and HIT heat treatment for long life.
• Visible durability and fit, with customers reporting it fits models like the 2005 Honda CRF70F well.
• Attractive gold finish that many buyers say looks great on the bike.
• High tensile strength of 5000 pounds per ft gives confidence under load.

Cons

• Limited to the specified 126-link length and 420 pitch applications, so sizing must match the bike.
• As a performance-oriented chain, occasional adjustment and maintenance are required to preserve life and appearance.

Specifications

Brand	RK Racing Chain
Model	GB420MXZ126
Links	126 links with connecting link
Material	Chromoly steel with special alloy pins
Heat Treatment	RK HIT (Heat Induction Transfer)
Tensile Strength	5000 pounds per ft

Our Verdict

The RK Racing Chain GB420MXZ126 is a sensible upgrade for minibike and small MX riders who want a lighter chain that does not sacrifice strength or looks. It delivers reliable tensile performance, precise fit for compatible bikes, and a clean gold finish that many owners appreciate, making it good value for riders replacing worn stock chains.

Frequently Asked Questions

Is this chain a direct replacement for small Honda CRF models?
Yes, customers report a perfect fit on certain small CRF models like the 2005 CRF70F when the 420 pitch and 126-link length match the bike.

How strong is this chain?
The chain has a rated tensile strength of 5000 pounds per ft thanks to chromoly construction and RK's HIT heat treatment.

Does it include a connecting link?
Yes, the product ships with a connecting link for installation and sizing.