{"product_id":"gy6s-1200-1165p-ncy-gear-set-15-38-drop-in-pre-pressed-gear-set-for-150cc-232cc-gy6-motors","title":"NCY GEAR SET (15*38) DROP IN PRE PRESSED GEAR SET FOR 150cc - 232cc GY6 MOTORS","description":"NCY 15T \/ 38T Performance Up Gear Set (Pre-Pressed) for GY6 125cc–200cc Engines \u003ch2\u003e\u003cstrong\u003ePRE-PRESSED \u0026amp; READY TO INSTALL — NO HYDRAULIC PRESS REQUIRED!\u003c\/strong\u003e\u003c\/h2\u003e \u003cp\u003e\u003cstrong\u003eThis is the biggest advantage of this listing.\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eUnlike standard NCY gear sets that require a \u003cstrong\u003e50-ton hydraulic press\u003c\/strong\u003e to swap the drive gear onto the countershaft, \u003cstrong\u003eour gear set comes professionally pre-pressed and assembled\u003c\/strong\u003e, saving you time, money, and the hassle of finding specialized equipment.\u003c\/p\u003e \u003cp\u003eSimply install the gear set using your original 42-tooth countershaft gear and get back on the road faster.\u003c\/p\u003e \u003ch2\u003eIncrease Top Speed Without Sacrificing Rideability\u003c\/h2\u003e \u003cp\u003eUnlock the full potential of your GY6 performance build with the \u003cstrong\u003eNCY 15T\/38T Final Drive Gear Set\u003c\/strong\u003e. Precision manufactured in \u003cstrong\u003eTaiwan\u003c\/strong\u003e, this transmission upgrade delivers approximately an \u003cstrong\u003e18% taller final drive ratio\u003c\/strong\u003e than the factory 13T\/40T gearing, allowing your engine to cruise at lower RPM while increasing overall top-end speed.\u003c\/p\u003e \u003cp\u003ePerfect for riders looking for a balanced transmission upgrade that improves highway cruising without making the scooter feel sluggish.\u003c\/p\u003e Why Upgrade Your Final Drive Gears? \u003cp\u003eThe final drive gears are the last reduction gears inside your GY6 transmission before power reaches the rear wheel. Changing these gears directly affects acceleration, cruising RPM, and maximum speed.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eFactory Gear Ratio\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e13T \/ 40T = \u003cstrong\u003e3.076:1\u003c\/strong\u003e\n\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eNCY Performance Gear Ratio\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e15T \/ 38T = \u003cstrong\u003e2.533:1\u003c\/strong\u003e\n\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eA lower numerical gear ratio allows the rear wheel to travel farther with each engine revolution, resulting in:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eHigher top speed\u003c\/li\u003e \u003cli\u003eLower cruising RPM\u003c\/li\u003e \u003cli\u003eBetter highway performance\u003c\/li\u003e \u003cli\u003eMore usable power from modified engines\u003c\/li\u003e \u003cli\u003eImproved overall riding comfort\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThe \u003cstrong\u003e15T\/38T\u003c\/strong\u003e provides an excellent balance between acceleration and top-end performance, making it one of the most versatile gear upgrades available.\u003c\/p\u003e Understanding GY6 Gear Ratios \u003ch3\u003eHigher Numerical Ratio (Example: Stock 3.076:1)\u003c\/h3\u003e \u003cp\u003eAdvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eFaster acceleration\u003c\/li\u003e \u003cli\u003eMore rear wheel torque\u003c\/li\u003e \u003cli\u003eBetter hill climbing\u003c\/li\u003e \u003cli\u003eBest for stock engines\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eDisadvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eHigher cruising RPM\u003c\/li\u003e \u003cli\u003eLower top speed\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eLower Numerical Ratio (Example: NCY 2.533:1)\u003c\/h3\u003e \u003cp\u003eAdvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eHigher maximum speed\u003c\/li\u003e \u003cli\u003eLower engine RPM while cruising\u003c\/li\u003e \u003cli\u003eBetter use of added horsepower\u003c\/li\u003e \u003cli\u003eSmoother high-speed riding\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eDisadvantages:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eSlightly less mechanical leverage at low speeds\u003c\/li\u003e \u003cli\u003eBest suited for engines producing additional power\u003c\/li\u003e \u003c\/ul\u003e Which Gear Ratio Should You Choose? \u003ch3\u003eStock 125cc–150cc Engines\u003c\/h3\u003e \u003cp\u003eFactory gearing is usually the best choice unless riding mostly on flat roads.\u003c\/p\u003e \u003ch3\u003e155cc–169cc Big Bore Builds\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003eExcellent Choice: NCY 15T \/ 38T\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eProvides:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eNoticeable increase in top speed\u003c\/li\u003e \u003cli\u003eComfortable cruising RPM\u003c\/li\u003e \u003cli\u003eStrong everyday acceleration\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003ePerfect for:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eMild performance builds\u003c\/li\u003e \u003cli\u003ePerformance exhausts\u003c\/li\u003e \u003cli\u003eVariator upgrades\u003c\/li\u003e \u003cli\u003eCamshaft upgrades\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003e171cc–180cc Performance Builds\u003c\/h3\u003e \u003cp\u003eThe \u003cstrong\u003e15T\/38T\u003c\/strong\u003e is an outstanding all-around street gear.\u003c\/p\u003e \u003cp\u003eWorks exceptionally well with:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e61mm cylinders\u003c\/li\u003e \u003cli\u003e63mm cylinders\u003c\/li\u003e \u003cli\u003eStroker crankshafts\u003c\/li\u003e \u003cli\u003ePerformance CVT systems\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003e180cc–200cc+ High Performance Builds\u003c\/h3\u003e \u003cp\u003eIdeal for larger displacement engines producing increased horsepower.\u003c\/p\u003e \u003cp\u003eBenefits include:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eLower highway RPM\u003c\/li\u003e \u003cli\u003eIncreased top speed\u003c\/li\u003e \u003cli\u003eBetter use of engine power\u003c\/li\u003e \u003cli\u003eImproved long-distance cruising\u003c\/li\u003e \u003c\/ul\u003e Specifications \u003ch3\u003eFront Counter Shaft\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eTeeth: 15\u003c\/li\u003e \u003cli\u003eOverall Length: 60mm\u003c\/li\u003e \u003cli\u003eSpline Length: 24mm\u003c\/li\u003e \u003cli\u003eOutside Diameter: 31.1mm\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eGear Press-On Area\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eLength: 12.08mm\u003c\/li\u003e \u003cli\u003eOutside Diameter: 19.08mm\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eShaft Ends\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eLength: 9–10.5mm\u003c\/li\u003e \u003cli\u003eOutside Diameter: 15mm\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eRear Final Drive Gear\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eTeeth: 38\u003c\/li\u003e \u003cli\u003eSpline Count: 19\u003c\/li\u003e \u003cli\u003eOutside Diameter: 71.2mm\u003c\/li\u003e \u003cli\u003eInside Diameter: 18mm\u003c\/li\u003e \u003cli\u003eWidth: 20mm\u003c\/li\u003e \u003c\/ul\u003e Installation \u003cp\u003e\u003cstrong\u003eHuge Time-Saving Advantage\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e✔ \u003cstrong\u003eCountershaft gear is professionally pre-pressed and assembled\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e✔ \u003cstrong\u003eNo 50-ton hydraulic press required\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e✔ \u003cstrong\u003eNo machine shop needed\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e✔ \u003cstrong\u003eNo extra labor costs\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eSimply reuse your factory \u003cstrong\u003e42-tooth countershaft gear\u003c\/strong\u003e during installation and enjoy a much easier installation process than standard gear kits.\u003c\/p\u003e Compatibility \u003cp\u003eFits most GY6-based 125cc–200cc engines including:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e157QMJ\u003c\/li\u003e \u003cli\u003e152QMI\u003c\/li\u003e \u003cli\u003e161QMK\u003c\/li\u003e \u003cli\u003e1P61QMK\u003c\/li\u003e \u003cli\u003eYN1P57QMJ\u003c\/li\u003e \u003cli\u003eJJ157QMJ\u003c\/li\u003e \u003cli\u003eBN157QMJ\u003c\/li\u003e \u003cli\u003eBN161QMK-A\u003c\/li\u003e \u003cli\u003e154FMI\u003c\/li\u003e \u003cli\u003e1P52FMI\u003c\/li\u003e \u003cli\u003e1P57QMJ\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 manufacturing premium scooter performance components in \u003cstrong\u003eTaiwan since 1997\u003c\/strong\u003e and is one of the industry's most respected names for drivetrain, suspension, and engine performance upgrades. Their ISO 9001-certified manufacturing ensures outstanding quality, durability, and precision.\u003c\/p\u003e \u003ch3\u003eWhy Choose the 15T\/38T?\u003c\/h3\u003e \u003cp\u003eCompared to the taller 15T\/37T gear set, the \u003cstrong\u003e15T\/38T offers a slightly more conservative 18% up gear\u003c\/strong\u003e, making it an excellent choice for riders who want increased top speed while maintaining stronger acceleration and better performance on hills. It's often considered the \"sweet spot\" for 155cc–180cc street builds, offering a great balance of speed, drivability, and everyday usability.\u003c\/p\u003e","brand":"ChinesePartsPro","offers":[{"title":"Default Title","offer_id":53556364935480,"sku":"1200-1165P","price":62.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0011\/8898\/6997\/files\/DSCN9831__57777.1584570920.jpg?v=1792867439","url":"https:\/\/www.chinesepartspro.com\/products\/gy6s-1200-1165p-ncy-gear-set-15-38-drop-in-pre-pressed-gear-set-for-150cc-232cc-gy6-motors","provider":"ChinesePartsPro","version":"1.0","type":"link"}