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How do you call the chain ring but the small 1 I now there chainrings but the small 1 are called more diffrents plzz answer??
Are asking what the cog on the rear wheel is called?
If that is what you mean it is called the freewheel. Unless you have a BMX bike with a freehub (rare on BMX bikes) in which case it would be a cassette.
on my bmx bike freehub
