[1987camry]

What is the width of you wheel? (6.5in, 7in, 7.5in?)

 

[1987camry]

Sorry, I forgot this question, what's the aspect ratio you would want with the different widths?

 

[1987camry]

Here, try http://www.miata.net/garage/tirecalc.html

Select the two different sizes, one in the stock and one in the new catigory, and it will tell you most, if not all, of the dimensions of the tires.