http://www.miata.net/garage/tirecalc.html
calculate with this site
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if you want look go with 16" if you want a bit of confort still left go with 15"
175/70R13 compare to 195/50R15 it's just .1% bigger so you'll will roll at 60.1mph when your Speedmeter indicate 60mph
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with 205/40R16 it's .5% smaler then you stock tire... so 60mph indicate will be 59.5mph real
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