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What Is the Function of a Sprocket?

BMX sprockets are required to create forward motion on a BMX bicycle. They are a key part of your bike’s drivetrain and impact how your ride feels. The sprocket is one of the flattest parts of a BMX setup and comes in a range of color schemes and styles to help you customize your setup.

BMX bike sprockets are usually made out of variations of aluminum or steel. Aluminum sprockets have a high strength to weight ratio, whereas steel sprockets are stronger, more affordable but heavier. You might want to also consider a BMX sprocket guard. This is particularly recommended for aggressive riders who regularly bite the rail or street.

What Sprocket Size Is Best for BMX?

The sprocket size that you need depends on your style of riding. BMX sprocket sizes are measured by how many teeth they have. On a Freestyle BMX bike, the most common number of teeth on the front sprocket is between 25 and 28. However, this can range from 16 to 45. Most modern complete BMX bikes come with a 25/9 gear ratio.

Increasing the number of teeth on the front sprocket will result in a higher gear ratio. This means that it will be harder to take off, but you will be able to reach faster speeds. Race BMX sprockets usually have a larger gear ratio so riders can generate more power.

Need more parts to reach your next BMX goal? See our BMX Wheels and BMX Pedals.

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