RK Racing Chain M520HD-120-03 M520HD-120 120-Link 520 Chain - Heavy

In this review the RK Racing Chain M520HD 120-link pack is evaluated for riders who need a robust, ready-to-fit replacement chain for midweight motorcycles. The bottom line: this three-pack of standard non O-ring 520 chains delivers clear value by combining Japanese steel components and two-point riveted construction in a pre-stressed, pre-stretched package that reduces early adjustment. It is best for routine street or off-road use up to about 400cc where straightforward clip-style master links and predictable tensile strength matter more than premium sealed chain benefits.

Key Features

• Japanese steel construction: The chain is made in Malaysia from Japanese steel, which provides consistent material quality and durability compared with lower-grade alternatives.
• Two-point riveted pins: Two-point riveting increases joint strength and helps the chain resist pin pullout during hard use.
• Pre-stressed and pre-stretched: Reduces initial elongation and the need for frequent early adjustments after installation.
• High tensile capacity: A maximum tensile rating of 7700 pounds/ft gives a solid safety margin for most 400cc street and off-road applications.
• Convenient pack size: The three-pack supply is useful for riders who service multiple bikes or prefer to keep spares on hand.

Who It's For

The RK M520HD is well suited for riders of single and twin motorcycles up to around 400cc who want a heavy-duty 520-series chain that installs with a clip-style master link and needs minimal break-in attention. Mechanics who prefer Japanese-spec components and a pre-stretched chain will appreciate the straightforward fit and feel.

It is not the ideal choice for riders who require sealed O-ring chains for extended lubrication life, or for high-displacement sportbikes that demand higher rated or specialized chains. Also, anyone prioritizing rust resistance above other factors should consider corrosion-treated alternatives.

Pros & Cons

Pros

• Strong construction with two-point riveted pins for reliable joint strength.
• Pre-stressed and pre-stretched to cut down on early adjustments after installation.
• Good value and convenient three-pack for spares or multiple bikes.
• Made to Japanese specs with consistent material quality.

Cons

• Not an O-ring chain, so it requires more frequent lubrication and offers less contamination protection.
• Some users report mixed long-term durability and rust issues, so finish and corrosion resistance may vary.

Specifications

Our Verdict

The RK Racing M520HD 120-link chain pack is a practical, value-oriented choice for midweight street and off-road motorcycles where strength and ease of replacement matter. It offers solid construction, respectable tensile capacity, and reduced initial stretch because it is pre-stressed, making it a sensible buy for riders who will maintain it regularly but do not need O-ring sealing or premium corrosion protection.

Frequently Asked Questions

Can this chain fit my 400cc street motorcycle?
Yes; the chain is rated for up to about 400cc street and NA off-road applications and uses standard 520 sizing.

Does the chain include connecting links?
Each chain uses a clip-type master link for joining; the pack provides standard connecting links.

Will it require frequent adjustment out of the box?
Because the chains are pre-stressed and pre-stretched they typically need fewer initial adjustments than untreated chains, though routine maintenance is still required.