{"product_id":"rk-racing-chain-gb420mxz-118-heavy-duty-mx-sx-racing-chain","title":"RK Racing Chain GB420MXZ-118 Gold 118 Link Heavy Duty MX Chain","description":"\u003cp\u003eIn this review the RK Racing Chain GB420MXZ-118 is evaluated for serious motocross riders who need the lightest, strongest non O-ring chain for 50cc to 125cc open class racing. The bottom line: this chain delivers exceptional tensile strength in a compact, race-ready package, offering a clear performance advantage where durability and low weight matter most. Its combination of chrome-moly construction, oversized alloy pins and RK's HIT heat treatment make the GB420MXZ-118 a practical choice for racers seeking proven strength and longevity without added bulk.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChrome-moly construction:\u003c\/strong\u003e Provides a strong, fatigue-resistant backbone that holds up under race conditions for dependable power transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless rollers and bushings:\u003c\/strong\u003e Reduce friction and wear for more consistent performance and longer service life between replacements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversized special alloy pins:\u003c\/strong\u003e Increase shear strength where chains typically fail, which improves real-world durability on rough tracks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHIT heat treatment:\u003c\/strong\u003e RK's Heat Induction Transfer process hardens all components for uniform strength and improved resistance to deformation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh tensile rating:\u003c\/strong\u003e The 5000 ft-lb maximum tensile strength gives confidence for professional-level 50cc to 125cc racing applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight design:\u003c\/strong\u003e At about 1.76 lb the chain minimizes rotating mass, helping acceleration and handling for competitive riders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe GB420MXZ-118 is aimed at motocross and supercross riders competing on 50cc to 125cc machines who prioritize a race-spec, non O-ring chain that balances minimal weight with maximum strength. It suits riders who swap chains frequently for performance and need a master link clip style for quick installation.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for casual street bikes or riders who require O-ring lubrication for extended low-maintenance life; those users should consider O-ring or sealed chain options for longer service intervals and different maintenance preferences.\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\u003eExceptional tensile strength and aftermarket durability compared to many stock chains.\u003c\/li\u003e\n\u003cli\u003eLightweight construction helps with acceleration on small-displacement race bikes.\u003c\/li\u003e\n\u003cli\u003eQuality fit and finish; customers report reliable fit on applications like the Honda CRF70F and improved operation over stock chains.\u003c\/li\u003e\n\u003cli\u003eGold finish provides corrosion resistance and an attractive race-oriented look.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNon O-ring design requires more frequent cleaning and lubrication than sealed chains to maintain wear life.\u003c\/li\u003e\n\u003cli\u003eClip master link may be less preferred by riders who favor rivet-style links for a permanent install.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eRK Racing Chain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eGB420MXZ (420 Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLink count\u003c\/td\u003e\n\u003ctd\u003e118 links\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum tensile\u003c\/td\u003e\n\u003ctd\u003e5000 ft-lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.76 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin length\u003c\/td\u003e\n\u003ctd\u003e15.7 mm\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 GB420MXZ-118 is a smart buy for competitive 50cc to 125cc riders who need a race-oriented, light and very strong non O-ring chain. Its chrome-moly parts, oversized pins and HIT treatment deliver a durable, high-performance package that represents strong value for racers willing to perform routine maintenance.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this chain suitable for 50cc to 125cc racing?\u003c\/strong\u003e\u003cbr\u003eYes. The chain's 5000 ft-lb tensile rating and lightweight 1.76 lb construction are intended for professional-level 50cc to 125cc open class racing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat master link does it use?\u003c\/strong\u003e\u003cbr\u003eThe GB420MXZ-118 uses a clip-type master link for assembly and service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this chain include heat-treated components?\u003c\/strong\u003e\u003cbr\u003eYes. All components are heat-treated using RK's HIT (Heat Induction Transfer) process for uniform hardness and wear resistance.\u003c\/p\u003e","brand":"RK Racing Chain","offers":[{"title":"Default Title","offer_id":48120433082587,"sku":"B000GTUG22","price":53.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61ix4ac5POL._AC_SL1000_ed10ed68-3f39-46fc-a254-175695c10eff.jpg?v=1768464632","url":"https:\/\/gearmusthave.com\/products\/rk-racing-chain-gb420mxz-118-heavy-duty-mx-sx-racing-chain","provider":"GearMustHave","version":"1.0","type":"link"}