http://www.miata.net/garage/tirecalc.html
forgot who posted this site last time this is talked about.. 
if anything i would leave the speed meter alone. it could/could not be a bitch to deal with.
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B14 Sentra GXE' (federal)
Hotshot CAI, Hotshot Header, SE-R cat. convertor, Stromung
next:
17in. rims, kumhos, agx/ground control setup., koni bump stops,
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