{"product_id":"rutu-atv-rear-sprocket-420-37t-48mm-68mm-bolt-spacing-heat-treated-steel-with-mounting-screws","title":"RUTU ATV Rear Sprocket 420 37T — 48mm\/68mm Bolt Spacing, Heat‑Treated Steel with Mounting Screws","description":"\u003cp\u003e\u003cstrong\u003eRUTU's 420 37-tooth rear sprocket is a heat-treated steel replacement designed for ATVs that need 48mm adjacent and 68mm opposite mounting hole centers, supplied with mounting screws for straightforward installation.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis heavy-duty replacement sprocket from RUTU is built for riders who need a precise 420-chain compatible rear gear with specific bolt spacing. Engineered from corrosion-resistant steel and hardened by heat treatment, the 37-tooth sprocket balances durability with smooth chain engagement. Before ordering, confirm your ATV uses a 420 chain and verify the mounting-hole geometry matches the 48mm and 68mm measurements described.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I confirm this sprocket fits my ATV?\u003c\/h3\u003e\n\u003cp\u003eCheck the current sprocket and chain on your vehicle. Look for a 420 imprint on the chain links or measure chain pitch; then measure bolt centers on your existing rear sprocket: adjacent holes should be 48mm apart and the opposing holes 68mm apart.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify chain marking: look for \"420\" on link plates\u003c\/li\u003e\n  \u003cli\u003eMeasure adjacent bolt center-to-center = 48mm\u003c\/li\u003e\n  \u003cli\u003eMeasure opposite bolt center-to-center = 68mm\u003c\/li\u003e\n  \u003cli\u003eCompare tooth count — this unit is 37T\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the materials and treatment used, and why do they matter?\u003c\/h3\u003e\n\u003cp\u003eThis sprocket is cut from premium steel and undergoes controlled heat treatment to raise hardness and wear resistance. Those steps reduce tooth deformation and help maintain correct chain engagement over time, which extends usable life compared with untreated replacements.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePremium steel construction resists corrosion\u003c\/li\u003e\n  \u003cli\u003eHeat-treated for improved hardness and longevity\u003c\/li\u003e\n  \u003cli\u003eMachine-finished tooth profile for smoother chain contact\u003c\/li\u003e\n  \u003cli\u003eDelivered with mounting screws for secure fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will changing to a 37T rear sprocket affect performance?\u003c\/h3\u003e\n\u003cp\u003eRear sprocket tooth count changes the final drive ratio. Moving to fewer rear teeth typically raises top speed at the cost of low-end pulling power, while more teeth increase torque and hill-climb performance but lower top speed. Keep the front sprocket unchanged for predictable results.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e37T gives a higher top-end compared with larger-tooth rear sprockets\u003c\/li\u003e\n  \u003cli\u003eExpect reduced low-speed torque versus a larger rear sprocket\u003c\/li\u003e\n  \u003cli\u003eDo not mix sprocket sizes without considering chain length and front sprocket\u003c\/li\u003e\n  \u003cli\u003e420 chain compatibility is required for safe operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat installation tips and precautions should I follow?\u003c\/h3\u003e\n\u003cp\u003eUse the supplied mounting screws and torque them to your ATV manufacturer’s specifications. Replace worn chains and inspect the front sprocket before installing to ensure even wear and correct chain alignment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTorque mounting bolts per vehicle manual\u003c\/li\u003e\n  \u003cli\u003eReplace the chain if links are slack or show wear\u003c\/li\u003e\n  \u003cli\u003eEnsure axle and sprocket alignment for even wear\u003c\/li\u003e\n  \u003cli\u003eConfirm chain size as 420 before fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Riders and mechanics looking for a robust, direct-replacement rear sprocket for 420-chain ATVs that require specific 48mm and 68mm bolt center spacing. This part suits recreational and light-duty off-road use where improved tooth hardness and precise bolt spacing are needed for a straightforward swap. If you need a different tooth count, chain type, or bolt pattern, check alternatives to match your vehicle’s specifications.\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: Is this sprocket compatible with my 420 chain ATV?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, if your ATV uses a 420 chain and the rear sprocket bolt centers measure 48mm adjacent and 68mm opposite, this 37T sprocket will fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will installing a 37-tooth rear sprocket change performance?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. A 37T rear sprocket raises top speed but reduces low-end torque compared with a larger-tooth rear sprocket.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RUTU","offers":[{"title":"Default Title","offer_id":55163382202711,"sku":"B0BNBSRFGK","price":33.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/rutu-rear-sprocket-front-view.jpg?v=1790343740","url":"https:\/\/britishgarage.co.uk\/products\/rutu-atv-rear-sprocket-420-37t-48mm-68mm-bolt-spacing-heat-treated-steel-with-mounting-screws","provider":"British Garage","version":"1.0","type":"link"}