I have 18x7.5, with 225/40/18 Federal Z-Rated Tires.
Tires are looking a bit low, but I don't know what the recommended PSI is.
Just wanted to know some suggestions, or what people are running w/
the same specs as mines.

 

I think most people around here use the 10% rule which is whatever your max tire pressure is, subtract off 10% and use that. I have 225/40/18 Falken 512's on my summer wheels and that max tire pressure was i think 51 and i even went down to like 36 or 38 because it was just too stiff for me and they ran great.

 

i agree with jwood...im usually around 5 psi below the max. remember to add air to your tires when the tires are cold (not driven on)