{"product_id":"generic-40t-high-speed-rear-sprocket-for-mini-bikes-37mm-bore-6-hole-hardened-steel","title":"Generic 40T High-Speed Rear Sprocket for Mini Bikes — 37mm Bore, 6-Hole, Hardened Steel","description":"\u003cp\u003e\u003cstrong\u003eHigh-strength 40-tooth rear sprocket engineered to upgrade mini bike speed and durability while fitting 37mm bore, 6-hole mounting patterns for popular models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis 40T high-speed rear sprocket is a precision-machined replacement part for a wide range of minibikes and small off-road machines. Built from hardened steel with heat-treated teeth, it accepts #40, #41 and 420 chain sizes and is designed to resist wear under repeated torque and chain friction. The 6-hole, 37mm-bore pattern matches OEM dimensions for direct installation on many Coleman, Mega Moto, Baja, Motovox and similar minibike models.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this 40-tooth sprocket affect my minibike's performance?\u003c\/h3\u003e\n\u003cp\u003eSwitching to a 40T sprocket shifts the balance toward higher top speed with a slight trade-off in initial acceleration compared with smaller rear sprockets. The additional teeth reduce engine RPM at road speed, helping smooth out cruising and lowering chain stress at higher velocities. Heat-treated tooth profiles also keep chain engagement consistent for predictable throttle response.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRaises top speed potential versus smaller rear gears\u003c\/li\u003e\n  \u003cli\u003eReduces RPMs at cruising speeds for less engine strain\u003c\/li\u003e\n  \u003cli\u003eHeat-treated teeth resist premature wear from chain contact\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this sprocket fit my minibike and how easy is installation?\u003c\/h3\u003e\n\u003cp\u003eThe sprocket features a standard 37mm bore with a 6-hole mounting layout that matches OEM patterns on many popular minibike models, so it bolts directly into place without modification. Pre-drilled holes align with factory hardware, making the swap a straightforward mechanic or DIY job. Verify bolt circle and bore size against your wheel hub before purchasing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e37mm bore and 6-hole pattern for direct OEM fit\u003c\/li\u003e\n  \u003cli\u003eCompatible with Coleman CT100U\/CC100X, Mega Moto MMB80\/105, Baja DB30, Motovox MBX10\/MBX11\u003c\/li\u003e\n  \u003cli\u003eNo extra machining or adapter required when sizes match\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat chains and loads is this sprocket compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis sprocket accepts #40, #41 and 420 roller chains commonly used on minibikes and small utility machines. It is precision-machined from hardened steel and heat-treated to handle typical riding loads, including recreational and heavier-duty conditions. Routine chain maintenance—lubrication and tension checks—will maximize longevity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for #40, #41 and 420 chain sizes\u003c\/li\u003e\n  \u003cli\u003eHardened steel construction withstands normal torque loads\u003c\/li\u003e\n  \u003cli\u003eRecommended regular lubrication and tension adjustments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is this sprocket and what quality checks does it pass?\u003c\/h3\u003e\n\u003cp\u003eThe sprocket undergoes load and wear testing to verify tooth integrity and bore alignment under operational stress. Heat treatment of the tooth surface reduces rapid wear, while precision machining ensures true concentricity for smoother chain tracking. These steps aim to reduce vibration and prolong both sprocket and chain service life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeat-treated teeth to resist accelerated wear\u003c\/li\u003e\n  \u003cli\u003eLoad-tested to validate performance under riding conditions\u003c\/li\u003e\n  \u003cli\u003ePrecision-machined bore and hole pattern for accurate mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Riders and mechanics seeking a direct-fit, performance-oriented rear sprocket for minibikes and small off-road machines—especially owners of Coleman CT100U\/CC100X, Mega Moto MMB80\/105, Baja Doodle Bug DB30, Motovox MBX10\/MBX11 and similar models. It suits DIY enthusiasts replacing worn drivetrain parts, shops upgrading gearing for higher top speeds, and anyone who wants a durable, OEM-pattern sprocket compatible with #40\/#41\/420 chains. Always confirm bore diameter and bolt pattern before installation.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this sprocket with my #41 chain?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The 40T sprocket is compatible with #40, #41 and 420 chains, provided chain pitch matches your drivetrain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this sprocket require machining to fit a 37mm hub?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No machining is needed if your hub uses a 37mm bore and the same 6-hole mounting pattern—it's designed for direct replacement.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Generic","offers":[{"title":"Default Title","offer_id":48085099315358,"sku":"B0FKH2J289","price":34.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/generic-40t-sprocket-front-view.jpg?v=1785867438","url":"https:\/\/northtrailauto.ca\/products\/generic-40t-high-speed-rear-sprocket-for-mini-bikes-37mm-bore-6-hole-hardened-steel","provider":"North Trail Auto","version":"1.0","type":"link"}