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:
- 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
