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PBI USA Rear Sprocket for the 2014-2020 Honda Grom 125 for stock 420 chain and many other Honda style engines is manufactured from aircraft quality 7075 T651 Plate Aluminum. Harder than steel and far lighter to save on unsprung weight. A division of Chris Products, Made in the USA!
The stock rear sprocket size on the Honda Grom is 34 tooth. You can go up to 35t, 36t, or 37t to increase your acceleration at the expense of top-end speed. If you go down to the 31t, 32t, or 33t you can get a higher top-end speed at the expense of acceleration. A few rules of thumb with gear ratios for sprockets are as follows:
Will fit 2022 Honda Grom 125 if the bolt holes are drilled out to 10mm. These sprockets are 8mm bolt size.