RK Racing Chain M520HD-120 520-Series Motorcycle Chain — 120-Link Heavy-Duty Pre-Stressed, Clip Master Link

RK Racing Chain M520HD-120 is a heavy-duty 520-series motorcycle chain—120 links long—designed for durable, pre-stressed performance on bikes up to about 400cc.

Built in Malaysia from Japanese steel and engineered to Japanese specifications, the RKM line combines two-point riveted pins and curled bushings for a robust ride-ready chain. This model is pre-stressed and pre-stretched at the factory to minimize initial elongation and reduce the need for frequent early adjustments, delivering a consistent fit and smoother power transfer compared with many competing heavy-duty chains.

How strong is the M520HD-120 for spirited riding?

The M520HD-120 has a high tensile strength and reinforced pin construction to withstand demanding use without sacrificing flexibility. It’s engineered to absorb torque precisely while resisting excessive stretch under load.

• Rated maximum tensile strength: 7,700 lbs (pounds/feet)
• Two-point riveted pins for secure link retention
• Curl-style bushings increase contact stability and wear resistance

Will this chain fit my bike and how is length handled?

This 520-series chain follows standard 15.875 mm pin-to-pin center spacing and includes 120 links—suitable for many street and off-road applications up to roughly 400cc. It ships with a clip-type master link for easy installation and adjustment to the correct length for your sprockets.

• Chain pitch / pin spacing: 15.875 mm
• 120 links supplied; trim to required length using the clip master link
• Approx. 19.2 links per foot for quick length calculations

What maintenance advantages does this pre-stressed chain offer?

Pre-stressing and pre-stretching reduce the initial run-in period, so the chain reaches stable length sooner and requires fewer early adjustments. That saves time at the bench and helps maintain consistent chain tension and alignment for improved driveline behavior.

• Lower initial elongation means fewer early tighten-ups
• Consistent tension reduces sprocket wear over time
• Factory treatment helps preserve geometry under load

What are the physical and handling characteristics I should expect?

RK designed the M520HD-120 to balance durability and manageable weight so it won’t unduly add rotational mass while providing heavy-duty performance. The chain weight and construction are tuned for daily street use and light to moderate off-road riding.

• Weight: approximately 3.65 lbs per 100 links (proportionally for 120 links)
• Clip-style master link included for installation convenience
• Suitable for bikes up to ~400cc for street/off-road use

Who is this chain for? The RK Racing Chain M520HD-120 is aimed at riders who want a rugged, ready-to-install 520-series chain that performs reliably with minimal break-in. It’s a solid choice for commuters, weekend sport riders, and light off-road enthusiasts using motorcycles in the sub-400cc class who expect a durable link set built to Japanese specifications and manufactured with Japanese steel. If you need a heavy-duty chain that reduces early maintenance and stays true under load, this model is engineered to meet those practical needs.