My previous question was: How to take apart this rear BMX hub?
How do I determine the size of my freewheel to replace it? I have seen on bicycle sites that a freewheel comes in sizes like 14t, 16t, 17t, 18t.
Here is a picture of my freewheel. It does not have any markings or inscriptions. The freewheel diameter of the ring, not the cog teeth is 55mm.