{"product_id":"rk-racing-chain-m520hd-120-520-series-120-link-heavy-duty-4-pack","title":"RK Racing Chain M520HD-120 520 Series 120-Link - Heavy Duty 4 Pack","description":"\u003cp\u003eOur review of the RK Racing Chain M520HD-120 4 Pack finds it best suited for riders who need a dependable, heavy-duty replacement chain for street or off-road bikes up to about 400cc. The biggest reason to buy is consistent build quality: chains in the RKM series are manufactured in Malaysia with Japanese steel, use two-point riveted pins and curled bushings, and arrive pre-stressed and pre-stretched so they run true with fewer adjustments. For the budget-conscious rider wanting a robust, factory-spec 520 chain in a convenient 4-pack, this chain delivers clear value.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eJapanese steel construction:\u003c\/strong\u003e The chain is made with Japanese steel to meet Japanese specs, which helps ensure consistent material strength and fatigue resistance.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eTwo-point riveted pins:\u003c\/strong\u003e Two-point riveting improves joint security under load and reduces the chance of pin pull-through on heavy-duty use.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eCurled bushings:\u003c\/strong\u003e Curled bushings add contact area and help distribute wear, extending usable life between replacements.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePre-stressed and pre-stretched:\u003c\/strong\u003e The chain arrives with initial stretch taken care of, so it needs fewer early adjustments and runs more reliably from first fitment.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eHeavy-duty tensile rating:\u003c\/strong\u003e A maximum tensile strength of 7700 pounds\/ft gives a safety margin for street and NA off-road use up to the specified capacity.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMaster link clip type:\u003c\/strong\u003e The clip master link makes installation and removal straightforward for home mechanics and trackside repairs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe M520HD-120 is aimed at riders of 250-400cc motorcycles and NA off-road machines who want a rugged, factory-spec 520 chain that is ready to run out of the box. It is particularly useful for DIY mechanics and small shops that appreciate the convenience of a 4-pack for multiple bikes or spare chain inventory.\u003c\/p\u003e\n\u003cp\u003eRacers pushing extreme limits or owners of high-power superbikes should look for chains rated for larger displacement and higher loads; similarly, if exceptional corrosion resistance is critical for coastal or salt-exposed use, consider a chain with dedicated corrosion protection, since some users report rust issues over time.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eMade with Japanese steel and two-point riveted pins for reliable strength and joint security.\u003c\/li\u003e\n \u003cli\u003ePre-stressed\/pre-stretched construction reduces early maintenance and initial adjustment frequency.\u003c\/li\u003e\n \u003cli\u003eGood value in a 4-pack for multiple bikes or spare stock, with easy-install clip master links.\u003c\/li\u003e\n \u003cli\u003eStrong tensile rating suitable for typical street and NA off-road 400cc class use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eSome customers report mixed durability related to rust and stretching during heavy use, so corrosion protection may be limited.\u003c\/li\u003e\n \u003cli\u003eNot intended for very high-displacement or heavily modified high-power bikes where a heavier series chain is required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\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 per pack\u003c\/td\u003e\n\u003ctd\u003e120 links (per chain), 4 pack\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\u003ePin to pin center\u003c\/td\u003e\n\u003ctd\u003e15.875mm\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\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe RK Racing Chain M520HD-120 4 Pack is a solid, cost-effective choice for riders of up to about 400cc who need a durable, ready-to-install 520 series chain. Its Japanese-steel construction, two-point riveted pins and pre-stressed finish deliver real value for routine street and NA off-road use, though riders requiring superior corrosion resistance or higher capacity should consider alternatives. For most home mechanics and fleet owners, the 4-pack is practical and economical.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this chain ready to install out of the box?\u003c\/strong\u003e\u003cbr\u003eThe chains are pre-stressed and pre-stretched, so they need fewer initial adjustments and are ready for installation with a clip master link.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat bike size is this chain suitable for?\u003c\/strong\u003e\u003cbr\u003eIt is intended for 520 series fitments up to about 400cc street and NA off-road applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long does the chain last and does it resist rust?\u003c\/strong\u003e\u003cbr\u003eBuild quality is good for wear life, but some users report rust and stretching under heavy use, so regular lubrication and inspection are recommended.\u003c\/p\u003e","brand":"RK Racing Chain","offers":[{"title":"Default Title","offer_id":48164730798299,"sku":"B097FBQJD3","price":184.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61aOvO1-04L._AC_SL1000.jpg?v=1769242165","url":"https:\/\/gearmusthave.com\/products\/rk-racing-chain-m520hd-120-520-series-120-link-heavy-duty-4-pack","provider":"GearMustHave","version":"1.0","type":"link"}