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Depends on where you are and what you are riding.

BMXes usually call it a driver at the back and a sprocket at the front.

Other bikes use different names.

At the rear, if it's only one, it's either a single speed freewheel, or a sprocket.

If it's more than one it's either a cassette or a multi-speed freewheel.

At the front it's called chain wheels or chain rings.

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Q: What is the circle of metal teeth that fits into a chain on your bicycle?
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A bicycle designer uses maths to work out the frame angles, and the gearing. The number of teeth on the chainwheels, sprockets (cassette), chain length, and so on, all depend on maths.


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The smallest sprocket is usually referred to as the "cog" and is commonly found on the rear wheel of a bicycle. It is designed to mesh with the chain and is typically the one with the fewest number of teeth among all the sprockets on the bike.


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Usually what happens is that the chain elongates under wear, which forces the rollers farther apart. Depending on set-up this can then cause the chain to ride higher up on the teeth of the sprocket, eventually to the point where it can jump over the top of the teeth. On other set-ups the elongated chain will wear out the flanks of the teeth to the point where their angle can no longer retain the chain.


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How do you calculate face width per gear?

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