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PBI Sprockets

PBI Sprockets Aluminum Honda Grom 125 (2014-2020) 420 (Stock Pitch) Rear Sprocket

PBI Sprockets Aluminum Honda Grom 125 (2014-2020) 420 (Stock Pitch) Rear Sprocket

SKU:PBI-1001-SIL-35 Tooth

Regular price $36.00 USD
Regular price Sale price $36.00 USD
Sale Sold out

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:

  • Drop teeth on front/add teeth to rear = increased torque, increased acceleration, wheelies, racetracks with short straights
  • Add tooth on front/reduce teeth on rear = increased top-end speed, open road cruising, lowers RPMs, better gas mileage, tracks with long straights
  • 1 down on the front is like adding 3 teeth on the rear
  • The bigger the rear sprocket, the lower the gearing and the faster the acceleration


  • 2014-2020 Honda Grom 125
  • 2019-2021 Honda Monkey 125 (4 speed)
  • 2019-2021 Honda Super Cub 125 (4 speed)

Will fit 2022 Honda Grom 125 if the bolt holes are drilled out to 10mm. These sprockets are 8mm bolt size.

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