{"product_id":"rk-racing-chain-m520hd-120-06-m520hd-120-120-link-heavy-duty-chain","title":"RK Racing Chain M520HD-120-06 M520HD-120 120-Link Heavy-Duty Chain","description":"\u003cp\u003eIn this review the RK Racing Chain M520HD-120-06 is examined for riders who need a durable, heavy-duty replacement chain for 400cc street bikes and off-road machines. The bottom line: this 120-link 520 series chain stands out for its \u003cstrong\u003epre-stressed and pre-stretched construction\u003c\/strong\u003e, which reduces early adjustment and helps maintain tension longer than many competitors. It is realistic to expect solid value and mechanical reliability for everyday and spirited riding, while being aware of some mixed feedback on long-term corrosion and occasional master link issues.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade with Japanese steel:\u003c\/strong\u003e Built in Malaysia to Japanese specs, the construction provides consistent strength and material quality for drivetrain use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-point riveted pins:\u003c\/strong\u003e The double rivet design improves pin retention and resists separation under load for safer operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurled bushings:\u003c\/strong\u003e Curled bushings increase contact area and help the chain run smoothly on sprockets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-stressed and pre-stretched:\u003c\/strong\u003e Factory conditioning reduces early stretch and minimizes the need for immediate adjustments after installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-duty tensile rating:\u003c\/strong\u003e Rated to 7700 pounds\/ft maximum tensile strength, suitable for strong loads up to the specified capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaster link clip type:\u003c\/strong\u003e Uses a clip master link for easy assembly and serviceability in the field or garage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe M520HD-120-06 is best for riders of small to mid-displacement motorcycles - up to about 400cc - who want a stout, serviceable 520-series chain that can handle street and off-road use. Enthusiasts who value easy installation and less initial adjustment will appreciate the pre-stretched condition and the clip master link.\u003c\/p\u003e\n\u003cp\u003eRiders who need premium corrosion protection or expect extreme high-mileage life without any maintenance may want to consider higher-end sealed O-ring chains or chains with dedicated rust-resistant coatings, since some users report rust and stretch over extended use.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolid construction with \u003cstrong\u003eJapanese steel\u003c\/strong\u003e and two-point rivets for reliable strength under load.\u003c\/li\u003e\n\u003cli\u003ePre-stressed design reduces break-in adjustments and helps maintain chain tension sooner.\u003c\/li\u003e\n\u003cli\u003eGood value per pack with six chains included for spares or multiple bikes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot an O-ring chain and has limited rust resistance compared with sealed chains, so it requires regular maintenance to avoid corrosion.\u003c\/li\u003e\n\u003cli\u003eCustomer reports mention occasional master link or stretch issues under heavy or long-term use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eM520HD (520 Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLinks\u003c\/td\u003e\n\u003ctd\u003e120 links per chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin to pin center\u003c\/td\u003e\n\u003ctd\u003e15.875mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin length\u003c\/td\u003e\n\u003ctd\u003e18.80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum tensile\u003c\/td\u003e\n\u003ctd\u003e7700 pounds\/ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.65 lb per 100 links\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaster link type\u003c\/td\u003e\n\u003ctd\u003eClip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe RK Racing Chain M520HD-120-06 is a practical, heavy-duty 520-series chain that delivers strong construction, easy installation with a clip master link, and less initial stretch thanks to pre-stressing. It represents good value for riders of up to 400cc machines who maintain their drivetrain; those prioritizing rust resistance or sealed O-ring protection should consider alternatives.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this chain suitable for a 400cc street bike?\u003c\/strong\u003e\u003cbr\u003eYes - the chain is rated for up to 400cc street and off-road use and is designed to meet Japanese specs for that class.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the chain come pre-stretched?\u003c\/strong\u003e\u003cbr\u003eYes - the chain is pre-stressed and pre-stretched to reduce early adjustment and initial elongation after installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of master link does it use?\u003c\/strong\u003e\u003cbr\u003eThe chain uses a clip-type master link for straightforward assembly and servicing.\u003c\/p\u003e","brand":"RK Racing Chain","offers":[{"title":"Default Title","offer_id":48240969285851,"sku":"B097FFNP5C","price":267.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61aOvO1-04L._AC_SL1000_9c4655d1-3caf-491a-8a40-4131b4bcdf65.jpg?v=1770967572","url":"https:\/\/gearmusthave.com\/products\/rk-racing-chain-m520hd-120-06-m520hd-120-120-link-heavy-duty-chain","provider":"GearMustHave","version":"1.0","type":"link"}