I just got a 16 tooth and tried to put on the old chain, BUT while it fits on the pedal cog (46 tooth), it does not on the rear cog. How can I solve this? a different cog in the back or a different chain? (on the rear cog, the chain has bigger "holes" than it should, so it doesnt fit...) Thank you so much for any advice...!
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You might have bought the wrong width chain. For road bikes/fixie there are two possibilities. These are the width of the chain. 3/32" and 1/8"
a 3/32" chain will not fit on a 1/8" cog but a 1/8" chain will fit on a 3/32" cog (but with extra space around the teeth).
If it is the length of the chain you are talking about then get a new chain. but the pedal cog might also need to be replaced.
More economic route might be buying a used rear cog (be warned this might be unsafe if you end up riding a lot wear will be faster)