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Here you go use this: http://www.miata.net/garage/tirecalc.html
Put in the orignal size then adjust the new tyre size to the right size.
Im assuming the alloys are prob 6" wide as my 15" ones are which means you can go as wide as 205.
I suppose something like 185/45/15, it would be a case of finding a size you are happy with at the right price though.
Currently in sleepdeprived's garage:
megane 1.6 16v