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First you need to be clear about what you're talking about.

In regular Bike-speak, sprockets go at the rear, and chainrings/chainwheels go at the front.

In BMX-speak, a sprocket goes at the front, and a driver goes at the rear.

If you're speaking BMX, the most obvious difference is the size, the tooth count.

For the same size driver, a bigger sprocket will make the bike slower off the start, but give it a higher top speed.

For the same size driver, a smaller sprocket will make the bike quicker off the start, but give it a lower top speed.

If you change the driver to match, start and top speed will remain the same, even with a smaller/bigger sprocket. A small sprocket will increase the ground clearance. Better if you're riding ramps as there's less risk of the sprocket/chain hitting the lip as you drop in. If you're not riding ramps, well, a smaller sprocket is still lighter, which is a kinda-sorta advantage. The downside is that the smaller they get, the faster they wear. And the chain wears too.

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Q: What happens when you have a small sprocket?
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