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And for bridgestones, these are good sites to get the speed and size difference.http://www.miata.net/garage/tirecalc.html shows % speed change and tire overlay imagehttp://pw1.netcom.com/~sgalaba/tiresize.htm#ustires shows the exact speed difference at inputed rates.
I don't know but i would think 215's might be a little too wide and rub abit on hard turns or u-turns.. interesting to know exactly. I want to upgrade our R92's for the 730's but I'd have to go to at least 205/50/15's which are slightly faster.
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