{"product_id":"driven-racing-428-rear-sprocket-for-honda-grom-and-monkey-125-169-542","title":"Driven Racing 428 Rear Sprocket for Honda Grom, Monkey 125","description":"\u003ch2\u003ePerformance Gearing: Driven Racing 428 EVO TECH Rear Sprocket\u003c\/h2\u003e\u003cp\u003ePrecision-engineered in the USA, the \u003cstrong\u003eDriven Racing EVO TECH Rear Sprocket\u003c\/strong\u003e is the ultimate performance upgrade for your Honda Grom or Monkey 125. CNC-machined and case-hardened for maximum durability, this sprocket is designed to withstand high-stress riding while providing smooth power delivery.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Durable:\u003c\/strong\u003e Case-hardened construction for extended wear life and reduced rotating mass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Performance:\u003c\/strong\u003e Available in multiple tooth counts to fine-tune your torque or top-end speed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Manufacturing:\u003c\/strong\u003e Made in the USA with strict tolerances for a perfect #428 chain fit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eDetailed Model Fitment\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eImportant Fitment Note:\u003c\/strong\u003e \u003cspan style=\"color: rgb(255, 42, 0);\"\u003e2022+ models use a different bolt pattern than 2014-2021 models. Please select your tooth count based on your specific year:\u003c\/span\u003e\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eRecommended Tooth Count\u003c\/th\u003e\n\u003cth\u003eCompatible Models\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2014–2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e34T, 35T, 36T\u003c\/td\u003e\n\u003ctd\u003eHonda Grom 125, Monkey 125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e2022–Present\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e38T, 39T, 40T\u003c\/td\u003e\n\u003ctd\u003eHonda Grom 125, Monkey 125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003e\u003cstrong\u003eAlso fits: \u003c\/strong\u003eHonda CR 80R ('85), CT 70 ('69-'94), XL 80S ('80-'86), and ZB 50 ('88).\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChain Size:\u003c\/strong\u003e #428\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 58mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal Bolt Spacing:\u003c\/strong\u003e 89mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Case-Hardened Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Driven Racing USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eGearing Guide\u003c\/h3\u003e\u003cp\u003eThe stock rear sprocket size on 2021 and earlier Honda Grom models is 34 teeth.  You can go up to 35 or 36 teeth to increase your low-end acceleration. \u003cbr\u003e\u003cbr\u003eThe stock rear sprocket size on the 2022+ Grom is 38t, and you can go up to 39 or 40 teeth to increase low-end acceleration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA few rules regarding gear ratios for sprockets are as follows:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducing teeth on the front or adding teeth to the rear sprocket \u003c\/strong\u003edelivers increased torque, increased acceleration, wheelies, great for tracks with short straights \/ urban riding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreasing teeth on the front or reducing teeth on the rear \u003c\/strong\u003edelivers increased top-end speed, lowers RPMs, better gas mileage, great for tracks with long straights \/ open road cruising.\u003c\/li\u003e\n\u003cli\u003eReducing 1 tooth on the front sprocket is equivalent to adding 3 teeth on the rear sprocket\u003c\/li\u003e\n\u003cli\u003eThe bigger the rear sprocket, the lower the gearing and the faster the acceleration\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eHonda CR 80R ('85), Honda CT 70-3Spd ('69-'94), Honda Grom 125, Honda XL 80S ('80-'86), Honda XR 70R ('97-'99), Honda ZB 50 ('88), Various unlisted makes\/models\u003c\/p\u003e","brand":"Driven Racing USA","offers":[{"title":"40T","offer_id":49986418409752,"sku":"169-542   40T","price":35.0,"currency_code":"USD","in_stock":true},{"title":"34T","offer_id":49986420048152,"sku":"169-542   34T","price":35.0,"currency_code":"USD","in_stock":true},{"title":"38T","offer_id":49986424373528,"sku":"169-542   38T","price":35.0,"currency_code":"USD","in_stock":true},{"title":"35T","offer_id":49986429223192,"sku":"169-542   35T","price":35.0,"currency_code":"USD","in_stock":true},{"title":"36T","offer_id":50045904159000,"sku":"169-542   36T","price":35.0,"currency_code":"USD","in_stock":true},{"title":"39T","offer_id":50693131206936,"sku":"169-542   39T","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/667477.jpg?v=1744838015","url":"https:\/\/www.scooterworks.com\/products\/driven-racing-428-rear-sprocket-for-honda-grom-and-monkey-125-169-542","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}