{"product_id":"qmb139-gear-up","title":"GY6 50cc Final Drive High Speed Gears - QMB139","description":"\u003cp style=\"font-size: 17px; line-height: 1.5;\"\u003eGet more top speed out of your 50cc QMB139 scooter. This gear-up kit swaps the stock gearbox gears for a taller final drive, so the engine turns fewer RPM at any given road speed. These are just the gears, and they do not come pressed. If you would like the full kit with the gearbox gasket, gear oil, and the gears already pressed, click \u003ca href=\"https:\/\/www.rollingwrenchdenver.com\/products\/qmb139-gear-up-kit-copy\"\u003e➡️ \u003cstrong\u003eHERE\u003c\/strong\u003e ⬅️\u003c\/a\u003e\u003c\/p\u003e\n\u003c!-- FITMENT --\u003e\n\u003cdiv style=\"border: 1px solid #121212; padding: 18px 20px; border-radius: 0; margin: 20px 0;\"\u003e\n\u003cp style=\"font-size: 13px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 12px;\"\u003e🔍 Does this fit your bike?\u003c\/p\u003e\n\u003cul style=\"margin: 0; padding-left: 20px; font-size: 15px; line-height: 1.6;\"\u003e\n\u003cli\u003e\u003cstrong\u003eGY6 50cc scooters with the QMB139 (139QMB) engine.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for 150cc+ GY6 engines\u003c\/strong\u003e (QMI152 \/ QMJ157). Those need our \u003ca href=\"https:\/\/www.rollingwrenchdenver.com\/products\/gy6-gear-up-kit\"\u003e➡️ \u003cstrong\u003e150cc+ gear-up kit.\u003c\/strong\u003e ⬅️\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eReal-world top speed depends on your engine, CVT setup, rider weight and conditions, and the gains are smaller if the engine can't pull the gearing. Not sure what engine you have? Check the engine code stamped on the case.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- BEFORE YOU ORDER --\u003e\n\u003cdiv style=\"border: 1px solid #121212; padding: 18px 20px; border-radius: 0; margin: 20px 0;\"\u003e\n\u003cp style=\"font-size: 13px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 12px;\"\u003e⚠️ Before you order\u003c\/p\u003e\n\u003cul style=\"margin: 0; padding-left: 20px; font-size: 15px; line-height: 1.6;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpect some low-end loss.\u003c\/strong\u003e Taller gearing trades acceleration for top speed, and a 50cc engine has little torque to spare.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest on built engines.\u003c\/strong\u003e A stock motor will see less benefit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks best with a tuned CVT.\u003c\/strong\u003e Variator weights or sliders help the engine pull the taller gearing.\u003c\/li\u003e\n\u003cli\u003eInstall is easiest while you already have the CVT or gearbox cover off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo returns on performance parts.\u003c\/strong\u003e Double-check your engine and option before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- WHAT'S INCLUDED --\u003e\n\u003cdiv style=\"border: 1px solid #121212; padding: 18px 20px; border-radius: 0; margin: 20px 0;\"\u003e\n\u003cp style=\"font-size: 13px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 12px;\"\u003e✓ What's in the box\u003c\/p\u003e\n\u003cul style=\"margin: 0; padding-left: 20px; font-size: 15px; line-height: 1.6;\"\u003e\n\u003cli\u003eGear set (countershaft gear and final drive gear)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Rolling Wrench","offers":[{"title":"QMB139 70cc - 80cc Gears Only","offer_id":67702629040357,"sku":"R-3-4","price":72.0,"currency_code":"USD","in_stock":true},{"title":"QMB139 90cc - 100cc Gears Only","offer_id":67702629073125,"sku":"R-3-4.1","price":72.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1415\/0180\/files\/gears.png?v=1792010713","url":"https:\/\/www.rollingwrenchdenver.com\/products\/qmb139-gear-up","provider":"Rolling Wrench","version":"1.0","type":"link"}