Quote Originally Posted by allout13 View Post
I got a .3" difference using this calculator
http://www.rimsntires.com/rt_specs.jsp
maybe it is wrong, or I plugged in the wrong numbers
disregarding the tires, because that can be changed. but just by doing numbers the sizes are identical. The offset, and width of those 2 sizes cancel each other out.

half a inch is about 12-13mm, and you have 30mm-15mm = 15mm,


But that 235 that guy has is way to wide for what hes trying to fit, he could easily get that with a 225/40 it woudl be perfect! Bu ttire brand and all that comes into play......its just too much...lol