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Discussion Starter · #1 ·
Here is a site I have relied on to make sure that tires will remain within a certain O.D.

TIRE SIZE CALCULATOR

Type in your factory size and then type in the tire size you are thinking about getting. Keep in mind that there are differences among manufacturers so it's not a perfect system. But this will give you a general idea of what you are getting and how far on or off your replacement tires will be compared to factory. You should stay within 5% unless you have a specific purpose in mind, i.e. racing.
 

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Discussion Starter · #4 ·
I've used that one too. They are both great to see your tire sizes.

The powerdog allows you to punch in multiple tire sizes. The miata site allows you to visually see the width as well as the diameter.
 
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