It's not 5mm. It's 5% of the width (255 mm) taller. The stocks are 29" vs. the 60 series being 30". Check out this site: http://www.miata.net/garage/tirecalc.html
PS...I never saw a question about a "dump". 
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2000 Rhino
Did you work on your P38 today? I know I did.
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