Inexpensive chain sprockets with different numbers of teeth. By changing the number of teeth on the front drive sprocket, you can influence speed or acceleration.
A higher number compared to the original usually means an increase in top speed and slightly lower acceleration if the rear sprocket remains unchanged. A lower number of teeth results in more acceleration and reduced top speed. Even a difference of 1 to 2 teeth will result in significant changes.
This sprocket has 13 teeth and is used on a 420 pitch chain.AI-translation