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Broken sprocket on rear wheel

I was riding my bike and this sprocket broke.



It is threaded on the inside, and attaches here on the rear wheel.


What is this part, and could I buy a replacement online???
it looks like a pretty standard threaded track/fixie cog, go to ebay and search for 14 tooth track cog or fixie cog.
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
Looks like this one:

but I could be wrong.....
I ordered that exact part wondering if it would work. That eases my mind a little. Thanks you you two!
Looks to me more like it was the outer cog on a freewheel. That is definitely not a track/fixed gear hub and it looks like the inner body of a freewheel still on it.

If the threading on a track cog is the same, it should work. (I have no idea if it is or not.) But if it's different, I think you want a new freewheel or just the outer cog if you could find one.

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