Leveling Kit
I say 235/85/16 would fit stock.
My f150 has 265/75/16 and this says they are 31.6 and his are 31.7..no difference
http://www.miata.net/garage/tirecalc.html
My f150 has 265/75/16 and this says they are 31.6 and his are 31.7..no difference
http://www.miata.net/garage/tirecalc.html

