{"product_id":"gy6s-1200-1164-37-ncy-gear-set-15-37-for-150cc-232cc-gy6-scooters-atvs-karts","title":"NCY GEAR SET (15*37) FOR 150cc - 232cc GY6 SCOOTERS ATVS KARTS","description":"NCY 15T \/ 37T Performance Up Gear Set for GY6 125cc–200cc Engines \u003cp\u003eIncrease your scooter's top speed and make better use of your engine's power with the \u003cstrong\u003eNCY 15T\/37T Performance Final Drive Gear Set\u003c\/strong\u003e. Manufactured in \u003cstrong\u003eTaiwan\u003c\/strong\u003e using premium materials and precision machining, this transmission upgrade is designed for riders who have installed performance modifications such as big bore kits, stroker cranks, upgraded camshafts, or high-performance CVT components.\u003c\/p\u003e \u003cp\u003eCompared to the factory \u003cstrong\u003e13T\/40T\u003c\/strong\u003e gear set, the NCY \u003cstrong\u003e15T\/37T\u003c\/strong\u003e gears provide approximately a \u003cstrong\u003e20% taller (up gear) ratio\u003c\/strong\u003e, allowing the engine to maintain lower RPM at cruising speeds while increasing the scooter's overall top-end speed.\u003c\/p\u003e \u003ch2\u003eWhy Upgrade Your Final Drive Gears?\u003c\/h2\u003e \u003cp\u003eThe final drive gears are the last reduction gears inside your GY6 transmission before power reaches the rear wheel. Changing these gears has a major effect on how your scooter accelerates and how fast it can travel.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eStock Gear Ratio (13T \/ 40T):\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e40 ÷ 13 = \u003cstrong\u003e3.076:1\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eNCY Up Gear Ratio (15T \/ 37T):\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e37 ÷ 15 = \u003cstrong\u003e2.466:1\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eBecause the numerical ratio is lower, the rear wheel turns farther with each engine revolution. This results in:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eHigher potential top speed\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eLower cruising RPM\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eMore usable power at higher speeds\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBetter performance from engines producing additional horsepower\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThe NCY 15T\/37T gear set provides approximately a \u003cstrong\u003e20% taller final drive ratio\u003c\/strong\u003e than stock.\u003c\/p\u003e Understanding GY6 Gear Ratios \u003ch3\u003eHigher Numerical Ratio (Example: 3.07:1 Stock)\u003c\/h3\u003e \u003cp\u003eA larger gear ratio gives the rear wheel more mechanical leverage.\u003c\/p\u003e \u003cp\u003eAdvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eStronger acceleration\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBetter hill climbing\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eFaster take-off\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eIdeal for stock or lightly modified engines\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eDisadvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eHigher engine RPM at cruising speed\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eLower maximum speed\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eLower Numerical Ratio (Example: 2.46:1 NCY Up Gear)\u003c\/h3\u003e \u003cp\u003eA smaller numerical ratio reduces mechanical leverage but allows the rear wheel to rotate farther with each engine revolution.\u003c\/p\u003e \u003cp\u003eAdvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eHigher top speed\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eLower cruising RPM\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBetter use of high horsepower engines\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eImproved highway performance\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eDisadvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eSlightly reduced mechanical torque at very low speeds\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eWorks best on engines that produce additional power\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e Which Gear Ratio Works Best? \u003ch3\u003eStock 125cc–150cc Engines\u003c\/h3\u003e \u003cp\u003eRecommended:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eFactory gearing\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eSmall up gears only if mostly flat riding\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eReason:\u003cbr\u003eStock engines generally do not produce enough power to fully utilize aggressive taller gearing.\u003c\/p\u003e \u003ch3\u003e155cc–169cc Big Bore Builds\u003c\/h3\u003e \u003cp\u003eIdeal Choice:\u003cbr\u003e\u003cstrong\u003eNCY 15T \/ 37T\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eExcellent combination of:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eStrong acceleration\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eIncreased top speed\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eComfortable cruising RPM\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003ePerfect for:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eMild performance builds\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eCamshaft upgrades\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance exhaust\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eVariator upgrades\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003e171cc–180cc Performance Builds\u003c\/h3\u003e \u003cp\u003eRecommended:\u003cbr\u003e\u003cstrong\u003eNCY 15T \/ 37T\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eThe additional displacement easily pulls the taller gearing while maintaining excellent acceleration.\u003c\/p\u003e \u003cp\u003eIdeal with:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e61mm cylinders\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e63mm cylinders\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eStroker crankshafts\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance CVT systems\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003e180cc–200cc+ High Performance Builds\u003c\/h3\u003e \u003cp\u003eThe NCY 15T\/37T is an excellent all-around choice, especially for street riding.\u003c\/p\u003e \u003cp\u003eEngines producing substantial horsepower benefit from taller gearing by:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eReducing unnecessary RPM\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eImproving sustained high-speed cruising\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBetter utilizing available horsepower\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e Specifications \u003cp\u003e\u003cstrong\u003eFront Counter Shaft\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eTeeth: 15\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOverall Length: 60mm\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eSpline Length: 24mm\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOutside Diameter: 31.1mm\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eGear Press-On Area\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eLength: 12.08mm\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOutside Diameter: 19.08mm\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eEnds\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eLength: 9–10.5mm\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOutside Diameter: 15mm\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eRear Final Drive Gear\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eTeeth: 37\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eSpline Count: 19\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOutside Diameter: 71.2mm\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eInside Diameter: 18mm\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eWidth: 20mm\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e Installation Note \u003cp\u003eThe factory countershaft gear is press-fitted onto the shaft.\u003c\/p\u003e \u003cp\u003eInstallation requires access to a \u003cstrong\u003e12-ton hydraulic press\u003c\/strong\u003e (or equivalent) to safely remove the original gear and install the new NCY gear.\u003c\/p\u003e \u003cp\u003eProfessional installation is recommended if proper equipment is unavailable.\u003c\/p\u003e Compatibility \u003cp\u003eFits most GY6-based 125cc–200cc engines including:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e157QMJ\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e152QMI\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e161QMK\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e1P61QMK\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eYN1P57QMJ\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eJJ157QMJ\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBN157QMJ\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBN161QMK-A\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e154FMI\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e1P52FMI\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e1P57QMJ\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eAlso compatible with many other engines whose engine code contains \u003cstrong\u003eQM\u003c\/strong\u003e, \u003cstrong\u003eQMK\u003c\/strong\u003e, \u003cstrong\u003eQMI\u003c\/strong\u003e, or \u003cstrong\u003eFM\u003c\/strong\u003e.\u003c\/p\u003e About NCY \u003cp\u003eNCY has been producing premium scooter performance components in \u003cstrong\u003eTaiwan since 1997\u003c\/strong\u003e and is recognized worldwide for manufacturing high-quality drivetrain, suspension, engine, and performance parts. Every component is built to strict quality standards for reliability, durability, and long service life.\u003c\/p\u003e","brand":"ChinesePartsPro","offers":[{"title":"Default Title","offer_id":53556327743800,"sku":"1200-1164 *37","price":40.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0011\/8898\/6997\/files\/s-l1600__81724.1584043755.jpg?v=1792867004","url":"https:\/\/www.chinesepartspro.com\/products\/gy6s-1200-1164-37-ncy-gear-set-15-37-for-150cc-232cc-gy6-scooters-atvs-karts","provider":"ChinesePartsPro","version":"1.0","type":"link"}