{"product_id":"rdln-gear-set-17-49-qmb139-1200-1283","title":"RDLN High-Speed Gear Set (17\/49) – GY6 50cc \/ 139QMB","description":"\u003ch2\u003eUnlock Top-End Speed: RDLN 17\/49 Performance Gear Set\u003c\/h2\u003e\u003cp\u003eIs your 50cc–100cc 139QMB engine revving at its limit without providing a higher top speed? The \u003cstrong\u003eRDLN Performance Gear Set (17\/49)\u003c\/strong\u003e is engineered to change your final drive ratio, allowing your engine to push the bike faster at lower RPMs. Depending on your current engine modifications and rider weight, this gear set can net an increase of \u003cstrong\u003eup to 7+ MPH\u003c\/strong\u003e in top-end velocity.\u003c\/p\u003e\u003ch3\u003ePerformance \u0026amp; Engineering\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTall Gearing for Big Bore Kits:\u003c\/strong\u003e Transitioning to a \u003cstrong\u003e2.88 Final Drive Ratio\u003c\/strong\u003e (down from the stock 3.41–3.71) significantly reduces \"over-revving\" and is the essential final step for scooters equipped with 72cc, 80cc, or 100cc Big Bore Kits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardened Steel Construction:\u003c\/strong\u003e Precision-cut from high-carbon steel to withstand the increased torque of performance engines and prevent gear whine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Efficiency:\u003c\/strong\u003e By lowering cruising RPMs at high speeds, this gear set can improve fuel economy and reduce long-term engine wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Acceleration:\u003c\/strong\u003e While taller gears slightly reduce off-the-line \"snap,\" the 17\/49 configuration provides the best balance of acceleration and high-speed cruising for the GY6 50cc 139QMA\/B platform.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment Guide\u003c\/h3\u003e\u003cp\u003eThis gear set is compatible with \u003cstrong\u003e139QMB \/ 1P39QMB\u003c\/strong\u003e engine cases found on nearly all 50cc 4-stroke Chinese scooters:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003eCategory\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eCompatible Engine Codes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard GY6 50\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e139QMA, 139QMB, 1P39QMB, 1P39QMA-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eExtended Codes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePopular Brands\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTaoTao, Wolf, Bintelli, Ice Bear, Kymco (select 4T), SYM, Lance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeeth Count:\u003c\/strong\u003e 17 Tooth \/ 49 Tooth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal Drive Ratio:\u003c\/strong\u003e 2.88\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 540g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Forged \u0026amp; Hardened Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Requires Hydraulic Press\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eCritical Installation Note:\u003c\/strong\u003e This is not a \"drop-in\" part. Installation \u003cstrong\u003erequires a hydraulic press\u003c\/strong\u003e to remove the old gears from the secondary shaft and press the new RDLN gears on. Professional installation is highly recommended.\u003c\/blockquote\u003e\u003cp\u003e\u003cstrong\u003e139QMB-based 50cc \/ 80cc engines with the following engine codes:\u003c\/strong\u003e\u003c\/p\u003e\u003ctable width=\"463\" height=\"100\" style=\"width: 87.0908%;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e139QMA\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e1P39QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e1P39QMA-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eYN139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eJJ1P39QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e139FMA-2\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eBD1P39QMB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eBN139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003e147QMD\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eOther QMA models\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%;\"\u003eOther QMB models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDon't see your engine listed? If the engine code includes \"QM\" or \"FM\", this product is compatible with your vehicle.\u003c\/span\u003e\u003c\/p\u003e\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eAbout RDLN:\u003c\/strong\u003e RDLN is a premier line of aftermarket performance upgrade systems and components for scooters. RDLN products are engineered to significantly improve the function, performance, and reliability of your vehicle with the ultimate goal being an optimal balance of price, power, and performance. RDLN’s extensive field-testing network ensures each product exceeds customer requirements and expectations every time. RDLN delivers full-throttle perf\u003c\/p\u003e","brand":"RDLN","offers":[{"title":"Default Title","offer_id":49227338645784,"sku":"1200-1283","price":28.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/1200-1283.webp?v=1740776163","url":"https:\/\/www.scooterworks.com\/products\/rdln-gear-set-17-49-qmb139-1200-1283","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}