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Most single-speed bikes(particularly BMXes) use a chain that is 1/8" wide. Chains are always bought a bit too long, and then cut to size. Use a chain breaker tool.

No one can tell you how many links you need, it depends on the chainwheel/sprocket combo and the size of the frame.

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13y ago
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13y ago

Pretty much whatever you feel like. Do you want to go faster, but can't spin the cranks any faster? Get a smaller one. Do you feel like it's hard to get the bike moving? Get a bigger one.

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14y ago

Go for a SS (singlespeed) chain. It measures 1/8"

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14y ago

A nine tooth sprocket is a great combination

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Q: What size chain do you need for a 25 9 sprocket?
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