{"product_id":"jt-sprockets-39-tooth-rear-steel-sprocket-39t-for-yamaha-yfz450-yfz450r-yfz450x","title":"JT Sprockets 39 Tooth Rear Steel Sprocket 39T for Yamaha YFZ450 YFZ450R YFZ450X","description":"\u003ch2\u003e39 Tooth Rear Steel Sprocket for Yamaha YFZ450 YFZ450R YFZ450X\u003c\/h2\u003e\u003cp\u003eThis JT Sprockets 39 tooth rear steel sprocket (39T) provides reliable power transfer and durability for Yamaha YFZ450, YFZ450R, and YFZ450X models, serving as a direct replacement OEM cross-reference JTR278.39.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis 39 tooth rear steel sprocket is a high-strength replacement designed for Yamaha YFZ450, YFZ450R, and YFZ450X ATVs, delivering precise engagement and long wear. The 39T sprocket offers a slight gearing change for improved top speed or acceleration depending on riding style.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMade from hardened steel for maximum wear resistance\u003c\/li\u003e\n\u003cli\u003e39 tooth count fine-tunes final drive ratio\u003c\/li\u003e\n\u003cli\u003ePrecision machined teeth for smooth chain engagement\u003c\/li\u003e\n\u003cli\u003eLightweight design reduces unsprung weight\u003c\/li\u003e\n\u003cli\u003eCorrosion-resistant finish for extended life\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YFZ450\u003c\/li\u003e\n\u003cli\u003efor Yamaha YFZ450R\u003c\/li\u003e\n\u003cli\u003efor Yamaha YFZ450X\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSport riding and recreational trail use\u003c\/li\u003e\n\u003cli\u003eCompetitive ATV racing and motocross\u003c\/li\u003e\n\u003cli\u003eReplacement during chain and sprocket maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTooth Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePosition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha YFZ450\/YFZ450R\/YFZ450X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this 39T sprocket improve my top speed over stock? \u003cstrong\u003eA:\u003c\/strong\u003e A 39T sprocket (one tooth less than stock) typically increases top speed slightly, but reduces acceleration; verify your stock gearing first.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this sprocket require any special tools to install? \u003cstrong\u003eA:\u003c\/strong\u003e Installation uses standard tools; you may need a chain breaker and a torque wrench for rear axle nut.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":44888322998358,"sku":"SZ1F07476","price":65.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_a96b590f-dd25-4ccf-a99a-c727c4c9739a.jpg?v=1781090326","url":"https:\/\/www.solidspare.com\/products\/jt-sprockets-39-tooth-rear-steel-sprocket-39t-for-yamaha-yfz450-yfz450r-yfz450x","provider":"Solid Spare","version":"1.0","type":"link"}