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@mdja
If your fixed has an easier ratio than the free, your bicycle will break. A freewheel allows the wheel to go faster than the cog, but not the other way round. The fixed will be pulling the wheel round at a low rotation, and the freewheel will be pulling the wheel round at a faster rotation, both attached to the same pair of cranks.
In short, you're fucked.
You'd have to make the fixed ratio higher than the free ratio, in which case as they say, you will have a fixed bike and not a free.