RK Racing Chain M520HD-120 520 Series 120-Link - Heavy-Duty Ride

In this review the RK Racing Chain M520HD-120 (520 Series) is evaluated for riders who need a reliable, heavy-duty replacement chain for street and off-road machines up to 400cc. The single biggest reason to consider this chain is its construction: made in Malaysia from Japanese steel with two-point riveted pins and curled bushings, and delivered pre-stressed and pre-stretched to reduce initial adjustments. That combination promises strong tensile strength and fewer break-in hassles for riders who value service life and fit.

Key Features

• Japanese steel construction: The chain is made in Malaysia using Japanese steel, which provides a durable base material for long-term use.
• Two-point riveted pins: Two-point riveted pins increase joint strength and reduce the risk of pin failure under harder riding conditions.
• Curled bushings: Curled bushings improve link articulation and wear resistance for smoother power transfer.
• Pre-stressed and pre-stretched: Delivered pre-stressed and pre-stretched to minimize early stretch and reduce initial adjustment time after installation.
• High maximum tensile: Rated to 7700 pounds/ft tensile strength, offering a robust safety margin for up to 400cc street and off-road use.
• Master link clip type: Uses a clip-type connecting link for straightforward installation and serviceability in the field.

Who It's For

This chain is best for motorcycle riders with mid-size machines up to 400cc who want a value-oriented, heavy-duty replacement that is built to Japanese specifications. It fits vehicle-specific applications where a 520-series chain is required and where durability and reduced initial adjustment are priorities.

Riders who demand premium corrosion protection or those running extremely high-power or race-tuned bikes above the stated 400cc range may prefer a different, more specialized chain with sealed O-rings or higher temperature treatments. Also, if on-board rust resistance is a top concern, consider chains with explicit anti-corrosion coatings.

Pros & Cons

Pros

• Robust build quality from Japanese steel and two-point riveted pins gives confidence in tensile strength and wear life.
• Pre-stressed, pre-stretched condition reduces initial slack and shortens break-in adjustments after fitting.
• Cost-effective two-pack configuration delivers value for routine maintenance and spare inventory.

Cons

• Some users report rust and stretching issues in service, so corrosion protection may be limited without regular maintenance.
• Clip-type master link is convenient but has been mentioned in a few reports as less secure than some factory-pressed links, so periodic checks are advised.

Specifications

Series	520
Links	120 per chain (2-pack)
Pin to pin center	15.875mm
Pin length	18.80mm
Maximum tensile	7700 pounds/ft
Weight	3.65 lb per 100 links
Master link type	Clip

Our Verdict

The RK Racing Chain M520HD-120 is a solid, value-focused heavy-duty chain for riders of up to 400cc machines who want a durable replacement that arrives pre-stressed for easier setup. It offers strong tensile ratings and practical serviceability, making it a good choice for routine maintenance and spares, though riders who need superior rust protection should plan regular cleaning and lubrication or consider a coated alternative.

Frequently Asked Questions

Will this chain fit my 520-spec motorcycle?
Yes, it is a 520-series, vehicle-specific fit type; confirm 520 chain compatibility and link count needed before purchase.

Does the chain come ready to install without break-in stretching?
It is pre-stressed and pre-stretched to minimize early stretch, but follow normal adjustment checks after a short initial use period.

Is the master link permanent?
The chain uses a clip-type connecting link for easy service and replacement; inspect the clip regularly for secure fitment.