What is the official name of the bicycle gear gear?

I wonder what the official name of the bicycle gear gear is.

There are three stages in the front and eight stages in the back, so I don't know what the name of the cogwheel is called because it is bitten by the chain.

I think I need to replace or check this, what should I search for?

1251 2017-08-08 Gentleman

A. 1

It's called a sprocket

Gentleman 8 years ago 0

A. 2

It's a sprocket
If you buy cheap ones from Alibal, they're a little over $11

Gentleman 8 years ago 0

Same Tag Can I use the gearvr controller in other applications besides vr?

Same Tag What do you mean by shift-up or shift-down on a bicycle?

Same Tag Is it possible to take a bicycle when I take the subway?

Same Tag How much does it cost to repair a bicycle puncture?

Same Tag How should I adjust the height of the bicycle saddle?

Same Time Where can I use SKT membership points?

Same Time What is the official name of the bicycle gear gear?

Same Time What is a community housing association apartment like?