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PBI USA Rear Sprocket for the Kawasaki Z 125 Pro 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 USA!
The stock rear sprocket size on the Kawasaki Z125 Pro is 30 tooth. You can go up to 31t, 32t or higher to increase your acceleration at the expense of top end speed. If you go down to the 28t or 29t 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: