{"product_id":"jmchstore-50t-rear-sprocket-for-mini-bikes-40-41-420-chain-6-bolt-49mm-bcd-gold-zinc-coated-high-strength-steel","title":"JMCHstore 50T Rear Sprocket for Mini Bikes (#40\/41\/420 Chain) — 6-Bolt 49mm BCD, Gold Zinc Coated High-Strength Steel","description":"\u003cstrong\u003eJMCHstore 50-tooth rear sprocket (#40\/41\/420) is a balanced-performance replacement designed to improve acceleration and top-end responsiveness on compatible mini bikes.\u003c\/strong\u003e\n\n\u003cp\u003eThis precision-machined rear sprocket from JMCHstore is made for popular small-frame bikes such as Coleman CT100U, Mega Moto MMB80\/105, Baja Doodle Bug DB30, Motovox MBX10 and several 105–212cc style mini bikes. Finished with a corrosion-resistant gold zinc coating and cut from high-strength steel, the 50T sprocket aims to deliver consistent power transfer while resisting wear and rust in everyday riding conditions.\u003c\/p\u003e\n\n\u003ch3\u003eWill this sprocket fit my mini bike?\u003c\/h3\u003e\n\u003cp\u003eIf your bike uses a #40, #41 or 420 chain and a six-bolt mounting pattern with a 49mm bolt circle, the JMCHstore 50T is likely compatible. It’s sized for a 37mm center hole and six 6.5mm mounting holes, so confirm those measurements against your wheel hub before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChain size: #40 \/ #41 \/ 420\u003c\/li\u003e\n  \u003cli\u003eTeeth count: 50\u003c\/li\u003e\n  \u003cli\u003eBolt circle diameter: 49mm (center-to-center)\u003c\/li\u003e\n  \u003cli\u003eCenter hole diameter: 37mm; six 6.5mm mounting holes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this sprocket affect ride performance?\u003c\/h3\u003e\n\u003cp\u003eThe 50-tooth design finds a middle ground between torque and top speed, giving improved acceleration without a large sacrifice in top-end. Precision-cut teeth and balanced construction reduce chain slip and smooth power delivery, which helps drivetrain components last longer.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBalanced gearing for acceleration and speed trade-off\u003c\/li\u003e\n  \u003cli\u003ePrecision-tooth machining minimizes wear and vibration\u003c\/li\u003e\n  \u003cli\u003eGold zinc plating reduces corrosion and friction-related issues\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this sprocket durable enough for upgraded engines?\u003c\/h3\u003e\n\u003cp\u003eYes — JMCHstore engineers this sprocket from high-strength steel to endure the higher loads produced by 212cc and larger engines commonly used to upgrade mini bikes. The gold zinc finish improves resistance to rust and environmental exposure, extending service intervals compared with untreated steel.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-strength steel construction for heavy loads\u003c\/li\u003e\n  \u003cli\u003eGold zinc coating for weather resistance\u003c\/li\u003e\n  \u003cli\u003eDesigned to handle higher RPMs without deformation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat installation and maintenance should I expect?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward if your hub matches the sprocket’s bolt pattern and center bore. Routine maintenance includes keeping the chain lubricated and inspecting mounting bolts for torque; a well-aligned chain further reduces wear and maximizes sprocket life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMatch bolt circle and center bore before installation\u003c\/li\u003e\n  \u003cli\u003eUse correct bolt torque and thread locking as needed\u003c\/li\u003e\n  \u003cli\u003eRegular chain lubrication and alignment checks prevent premature wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this sprocket for? Riders who modify or maintain small-frame mini bikes and want a reliable, mid-range gearing option will benefit most from the JMCHstore 50T rear sprocket. It’s suited to hobbyists, parts resellers, and anyone running popular models like the Coleman CT100U, Mega Moto, Baja Doodle Bug DB30, Motovox MBX10, or similar compact 105–212cc machines — provided the wheel hub uses a six-bolt pattern and a #40\/#41\/420 chain. Note: this sprocket does not fit go-karts that use different mounting standards.\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: What chain sizes fit this sprocket?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It fits #40, #41 and 420 chain sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will it work on go-karts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — it does not fit go-karts due to a different mounting pattern.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"JMCHstore","offers":[{"title":"Default Title","offer_id":48083833389214,"sku":"B0F4XHX7WZ","price":58.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/jmchstore-50t-front-face.jpg?v=1785836828","url":"https:\/\/northtrailauto.ca\/products\/jmchstore-50t-rear-sprocket-for-mini-bikes-40-41-420-chain-6-bolt-49mm-bcd-gold-zinc-coated-high-strength-steel","provider":"North Trail Auto","version":"1.0","type":"link"}