PBI Front Sprocket for all year Honda Grom / Monkey 125
The stock sprocket on the Honda Grom / Monkey is a 15t. Going to a smaller front will increase leverage and thus help with acceleration, while lowering your top speed if you are already capable of hitting the rev limiter in your top gear. A smaller front sprocket can also increase your top speed if you are not able to hit the rev limiter in your top gear. Going to a larger front sprocket reduces revs at the same speed, and will increase your potential top speed if you are already hitting the rev limiter in your top gear.