Honda Grom / Monkey Rear Sprocket

PBI Rear Sprocket for all year Honda Grom / Monkey 125 The stock rear sprocket on the Honda Grom / Monkey is a 34t. Going to a larger rear 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 rear sprocket can also increase your top speed if you are not able to hit the rev limiter in your top gear. Going to a smaller rear 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.