Which size tire should I get:

225-40-18 or 235-40-18

You guys were a great help w/ the supercharger, thank you for all of your opinions. Now I wanted to know your opinion on tire size.. I know what you're gonna say, do a search. I did, but can't make up my mind. Please advise !



OH! By the way, the tires will be going on these:

 

If the rim is: 18x8 then 245/40/18
18x7.5 then 235/40/18
18x7 then 225/40/18

 

Sorry! Forgot to add that it was a 18 X 7.5

So 235 then?

Will i have to get the spedo adjusted? or just say F#%@ it