{"product_id":"engine-sprocket-25t-bullet-electra-110221-12","title":"Engine Sprocket 25T (Primary Drive) for Royal Enfield Bullet \/ Electra (Legacy) | 110221\/12 | Genuine","description":"\u003cp data-start=\"231\" data-end=\"577\"\u003e\u003cstrong data-start=\"231\" data-end=\"258\"\u003eRoyal Enfield 110221\/12\u003c\/strong\u003e is the \u003cstrong data-start=\"266\" data-end=\"301\"\u003eEngine Sprocket (Primary Drive)\u003c\/strong\u003e used on select \u003cem data-start=\"317\" data-end=\"344\"\u003elegacy Bullet\/Electra-era\u003c\/em\u003e Royal Enfield models. It is commonly referred to as the \u003cstrong data-start=\"401\" data-end=\"435\"\u003e25-tooth (25T) engine sprocket\u003c\/strong\u003e, and is also seen as an update\/replacement reference for older \u003cstrong data-start=\"499\" data-end=\"509\"\u003e110221\u003c\/strong\u003e numbering in some catalogs. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"579\" data-end=\"843\"\u003eIf your bike has issues like \u003cstrong data-start=\"608\" data-end=\"631\"\u003eprimary chain noise\u003c\/strong\u003e, \u003cstrong data-start=\"633\" data-end=\"656\"\u003eworn sprocket teeth\u003c\/strong\u003e, or inconsistent power transfer to the clutch basket\/primary drive, replacing the engine sprocket during a primary chain service can restore smoothness and reduce premature chain wear.\u003c\/p\u003e\n\u003cp data-start=\"845\" data-end=\"1162\"\u003e\u003cstrong data-start=\"845\" data-end=\"868\"\u003eOEM vs aftermarket:\u003c\/strong\u003e Aftermarket sprockets often vary in tooth profile accuracy and heat-treatment consistency. An OE-spec sprocket helps maintain correct primary chain engagement and long-term durability—especially important on older Bullets where primary drive health directly affects refinement and reliability.\u003c\/p\u003e\n\u003cp data-start=\"1164\" data-end=\"1387\"\u003e\u003cstrong data-start=\"1164\" data-end=\"1211\"\u003eImportant fitment note (to reduce returns):\u003c\/strong\u003e Different Bullet\/Electra generations (AVL\/CI\/Lean-burn\/EFi\/UCE) can use different primary components. Buy only if your parts manual\/microfiche maps your bike to \u003cstrong data-start=\"1373\" data-end=\"1386\"\u003e110221\/12\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 data-start=\"1389\" data-end=\"1413\"\u003eKey Features \u003c\/h2\u003e\n\u003cul data-start=\"1414\" data-end=\"2062\"\u003e\n\u003cli data-start=\"1414\" data-end=\"1516\"\u003e\n\u003cp data-start=\"1416\" data-end=\"1516\"\u003eGenuine Royal Enfield spare: \u003cstrong data-start=\"1445\" data-end=\"1476\"\u003e110221\/12 – ENGINE SPROCKET\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1517\" data-end=\"1621\"\u003e\n\u003cp data-start=\"1519\" data-end=\"1621\"\u003eCommonly sold\/identified as \u003cstrong data-start=\"1547\" data-end=\"1581\"\u003eEngine Sprocket 25 Teeth (25T)\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1622\" data-end=\"1733\"\u003e\n\u003cp data-start=\"1624\" data-end=\"1733\"\u003eReference mapping seen in the market: \u003cstrong data-start=\"1662\" data-end=\"1693\"\u003e110221\/12 (old ref: 110221)\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1734\" data-end=\"1821\"\u003e\n\u003cp data-start=\"1736\" data-end=\"1821\"\u003eDesigned for correct primary drive chain engagement when matched to the right model\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1822\" data-end=\"1900\"\u003e\n\u003cp data-start=\"1824\" data-end=\"1900\"\u003eIdeal during primary chain replacement, clutch service, or engine overhaul\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1901\" data-end=\"1971\"\u003e\n\u003cp data-start=\"1903\" data-end=\"1971\"\u003eHelps reduce chain slap\/noise caused by hooked\/worn sprocket teeth\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1972\" data-end=\"2062\"\u003e\n\u003cp data-start=\"1974\" data-end=\"2062\"\u003eQuantity: \u003cstrong data-start=\"1984\" data-end=\"1995\"\u003e1 piece\u003c\/strong\u003e per bike (engine sprocket) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2064\" data-end=\"2127\"\u003eCompatibility Table \u003c\/h2\u003e\n\u003cp data-start=\"2128\" data-end=\"2422\"\u003e\u003cspan style=\"color: rgb(254, 6, 6);\"\u003e\u003cstrong\u003ePLEASE CHECK PART NUMBER BEFORE PURCHASE \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2424\" data-end=\"3548\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2424\" data-end=\"2466\"\u003e\n\u003ctr data-start=\"2424\" data-end=\"2466\"\u003e\n\u003cth data-start=\"2424\" data-end=\"2432\" data-col-size=\"sm\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"2432\" data-end=\"2446\" data-col-size=\"sm\"\u003eEngine Type\u003c\/th\u003e\n\u003cth data-start=\"2446\" data-end=\"2457\" data-col-size=\"sm\"\u003eBS Stage\u003c\/th\u003e\n\u003cth data-start=\"2457\" data-end=\"2466\" data-col-size=\"md\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2485\" data-end=\"3548\"\u003e\n\u003ctr data-start=\"2485\" data-end=\"2616\"\u003e\n\u003ctd data-start=\"2485\" data-end=\"2498\" data-col-size=\"sm\"\u003eBullet 350\u003c\/td\u003e\n\u003ctd data-start=\"2498\" data-end=\"2523\" data-col-size=\"sm\"\u003eLegacy Bullet platform\u003c\/td\u003e\n\u003ctd data-start=\"2523\" data-end=\"2527\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"2527\" data-end=\"2616\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"2566\" data-end=\"2576\"\u003everify\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2617\" data-end=\"2744\"\u003e\n\u003ctd data-start=\"2617\" data-end=\"2626\" data-col-size=\"sm\"\u003eDeluxe\u003c\/td\u003e\n\u003ctd data-start=\"2626\" data-end=\"2651\" data-col-size=\"sm\"\u003eLegacy Bullet platform\u003c\/td\u003e\n\u003ctd data-start=\"2651\" data-end=\"2655\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"2655\" data-end=\"2744\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"2694\" data-end=\"2704\"\u003everify\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2745\" data-end=\"2874\"\u003e\n\u003ctd data-start=\"2745\" data-end=\"2756\" data-col-size=\"sm\"\u003eMachismo\u003c\/td\u003e\n\u003ctd data-start=\"2756\" data-end=\"2781\" data-col-size=\"sm\"\u003eLegacy Bullet platform\u003c\/td\u003e\n\u003ctd data-start=\"2781\" data-end=\"2785\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"2785\" data-end=\"2874\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"2824\" data-end=\"2834\"\u003everify\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2875\" data-end=\"3002\"\u003e\n\u003ctd data-start=\"2875\" data-end=\"2884\" data-col-size=\"sm\"\u003eCampus\u003c\/td\u003e\n\u003ctd data-start=\"2884\" data-end=\"2909\" data-col-size=\"sm\"\u003eLegacy Bullet platform\u003c\/td\u003e\n\u003ctd data-start=\"2909\" data-end=\"2913\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"2913\" data-end=\"3002\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"2952\" data-end=\"2962\"\u003everify\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3003\" data-end=\"3133\"\u003e\n\u003ctd data-start=\"3003\" data-end=\"3021\" data-col-size=\"sm\"\u003eElectra 4S (KS)\u003c\/td\u003e\n\u003ctd data-start=\"3021\" data-end=\"3038\" data-col-size=\"sm\"\u003eLegacy Electra\u003c\/td\u003e\n\u003ctd data-start=\"3038\" data-end=\"3042\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"3042\" data-end=\"3133\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"3081\" data-end=\"3091\"\u003everify\u003c\/strong\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3134\" data-end=\"3264\"\u003e\n\u003ctd data-start=\"3134\" data-end=\"3152\" data-col-size=\"sm\"\u003eElectra 5S (KS)\u003c\/td\u003e\n\u003ctd data-start=\"3152\" data-end=\"3169\" data-col-size=\"sm\"\u003eLegacy Electra\u003c\/td\u003e\n\u003ctd data-start=\"3169\" data-end=\"3173\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"3173\" data-end=\"3264\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"3212\" data-end=\"3222\"\u003everify\u003c\/strong\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3265\" data-end=\"3404\"\u003e\n\u003ctd data-start=\"3265\" data-end=\"3281\" data-col-size=\"sm\"\u003eMachismo A350\u003c\/td\u003e\n\u003ctd data-start=\"3281\" data-end=\"3309\" data-col-size=\"sm\"\u003eAVL-era reference appears\u003c\/td\u003e\n\u003ctd data-start=\"3309\" data-end=\"3313\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"3313\" data-end=\"3404\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"3352\" data-end=\"3362\"\u003everify\u003c\/strong\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3405\" data-end=\"3548\"\u003e\n\u003ctd data-start=\"3405\" data-end=\"3432\" data-col-size=\"sm\"\u003eThunderbird KS (CDI\/TCI)\u003c\/td\u003e\n\u003ctd data-start=\"3432\" data-end=\"3453\" data-col-size=\"sm\"\u003eLegacy Thunderbird\u003c\/td\u003e\n\u003ctd data-start=\"3453\" data-end=\"3457\" data-col-size=\"sm\"\u003e❓\u003c\/td\u003e\n\u003ctd data-start=\"3457\" data-end=\"3548\" data-col-size=\"md\"\u003eListed by one dealer database only — \u003cstrong data-start=\"3496\" data-end=\"3506\"\u003everify\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 data-start=\"3818\" data-end=\"3831\"\u003eVariants\u003c\/h2\u003e\n\u003cul data-start=\"3832\" data-end=\"3918\"\u003e\n\u003cli data-start=\"3832\" data-end=\"3918\"\u003e\n\u003cp data-start=\"3834\" data-end=\"3918\"\u003eSingle unit (1 pc) — \u003cstrong data-start=\"3855\" data-end=\"3868\"\u003e110221\/12\u003c\/strong\u003e only\u003cbr data-start=\"3873\" data-end=\"3876\"\u003e(No LH\/RH, no color variants for sprocket)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3920\" data-end=\"3935\"\u003eFAQs \u003c\/h2\u003e\n\u003cp data-start=\"3936\" data-end=\"4130\"\u003e\u003cstrong data-start=\"3936\" data-end=\"3975\"\u003e1) Is 110221\/12 the same as 110221?\u003c\/strong\u003e\u003cbr data-start=\"3975\" data-end=\"3978\"\u003eSome sellers reference \u003cstrong data-start=\"4001\" data-end=\"4044\"\u003e110221\/12 as replacement for old 110221\u003c\/strong\u003e—always match by parts manual for your bike. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"4132\" data-end=\"4283\"\u003e\u003cstrong data-start=\"4132\" data-end=\"4178\"\u003e2) How many teeth does this sprocket have?\u003c\/strong\u003e\u003cbr data-start=\"4178\" data-end=\"4181\"\u003eCommonly sold\/identified as \u003cstrong data-start=\"4209\" data-end=\"4216\"\u003e25T\u003c\/strong\u003e for this part reference. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"4285\" data-end=\"4446\"\u003e\u003cstrong data-start=\"4285\" data-end=\"4359\"\u003e3) Will it fit Classic 350 Reborn \/ Meteor \/ Hunter \/ Interceptor 650?\u003c\/strong\u003e\u003cbr data-start=\"4359\" data-end=\"4362\"\u003eNo—those are different platforms. Order only if your microfiche shows \u003cstrong data-start=\"4432\" data-end=\"4445\"\u003e110221\/12\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"4448\" data-end=\"4590\"\u003e\u003cstrong data-start=\"4448\" data-end=\"4490\"\u003e4) What symptoms indicate replacement?\u003c\/strong\u003e\u003cbr data-start=\"4490\" data-end=\"4493\"\u003ePrimary chain noise, hooked sprocket teeth, excessive slack fluctuation, or rough power transfer.\u003c\/p\u003e\n\u003cp data-start=\"4592\" data-end=\"4755\"\u003e\u003cstrong data-start=\"4592\" data-end=\"4637\"\u003e5) Should I change the primary chain too?\u003c\/strong\u003e\u003cbr data-start=\"4637\" data-end=\"4640\"\u003eRecommended to inspect and replace chain\/tensioner pad if worn—new sprocket + old stretched chain can wear quickly.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50863666823463,"sku":null,"price":660.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/ChatGPTImageDec2_2025_10_22_57PM_a449fa02-96ca-4831-b2b5-a3ad448d7d9d.png?v=1776338959","url":"https:\/\/underthehood.co.in\/products\/engine-sprocket-25t-bullet-electra-110221-12","provider":"UNDER THE HOOD","version":"1.0","type":"link"}