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ALUMINUM RG REAR 428 PITCH Conversion Sprocket for Honda Grom 125 (2014-2020), Honda Monkey 125 (2018-2021), Super Cub 125 (ALL YEARS), and Trail 125 (ALL YEARS)
This is the 428 pitch size, which is a 428 pitch front sprocket and 428 pitch chain to complete the 428 pitch chain and sprocket conversion. 428 pitch is a standard size for the Honda Trail 125.
Aluminum RG Rear sprocket for 4-Speed Honda Grom/Monkey 125 in 428 Pitch. 428 Chain is recommended for Honda Grom's/Monkeys with higher displacement engines or heavy riders. These gears are manufactured from aircraft quality 7075 T651 Plate Aluminum. Harder than steel and far lighter to save on unsprung weight.
The stock rear sprocket size on the Honda Grom 125cc is 34 tooth. If you go down to the 29t or 30T 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:
ENGINE FITMENT with 428 Chain: