RK Racing Chain 520-Series Motorcycle Chain M520HD-120 120-Link Non O-Ring — Heavy-Duty, Pre-Stressed

RK Racing Chain M520HD-120 is a heavy-duty 520-series, 120-link standard non O-ring motorcycle chain built for durability, pre-stressed performance, and reliable power transfer up to 400cc applications.

This RKM-series chain blends Japanese steel with Malaysian manufacturing to meet strict Japanese specifications. It uses two-point riveted pins and curled bushings, and is pre-stressed and pre-stretched at the factory to reduce initial elongation and the need for frequent adjustments. The M520HD-120 is designed for street and off-road bikes up to roughly 400cc and aims to deliver long wear life and solid tensile strength for riders who prioritize rugged reliability.

How does this chain stand up to wear and longevity?

The M520HD-120 is engineered for extended service life through material choice and assembly methods. Pre-stretching reduces early elongation, and the curled bushing design minimizes friction between links, helping the chain retain correct pitch and reduce rapid wear.

• Maximum wear life index rated at 200 for consistent durability
• Two-point riveted pins and curled bushings to reduce movement and friction
• Pre-stressed/pre-stretched to cut down on initial adjustment and elongation

Will this chain handle the power and stresses of my bike?

The chain’s mechanical ratings show it’s built to resist high loads encountered in everyday road and light off-road riding. With a maximum tensile rating of 7,700 pounds/feet and a standard 520-series pitch, it provides a strong connection between your sprockets for dependable torque transmission.

• Maximum tensile strength: 7,700 pounds/feet for heavy-duty loads
• 520-series dimensions (15.875mm pin-to-pin center) for common sprocket fitment
• Suitable for motorcycles up to about 400cc on street or non-competitive off-road use

What fitment and installation details should I know?

The M520HD-120 comes as a 120-link standard, non O-ring chain with a clip-type master link for field-friendly installation. Its weight and link density give a predictable feel and make it straightforward to size for most 520 applications when paired with the appropriate front and rear sprockets.

• Length: 120 links (19.2 links per foot) for common sprocket and wheel setups
• Master link: clip-style for simple assembly without special tools
• Weight: approximately 3.65 pounds per 100 links (gives scale for full-chain weight)

What materials and origin affect quality?

RK Racing Chain’s RKM line is produced in Malaysia using Japanese steel to match established Japanese engineering standards. Those materials and controlled manufacturing processes help achieve consistent tolerances and the high tensile ratings that serious riders expect.

• Manufactured in Malaysia using Japanese steel for proven material properties
• Built to Japanese specifications with precise pin length and bushing geometry
• Two-point riveted pin design for added joint security

Who is this for: The RK Racing Chain M520HD-120 is aimed at riders who need a rugged, entry-to-mid-level heavy-duty 520-series chain for street or light off-road motorcycles up to about 400cc. It’s a solid choice for owners who prefer a factory pre-stretched, reliable non O-ring chain with clip master link convenience and a proven tensile rating for everyday and adventurous riding.