Widest tire on the stock 18" rims of Pacifica 2021

I currently have 235/60/R18 on a Pacifica 2021. I believe the 18" rims are 7.5" wide. Can I install a set of 255/55/R18? The diameter is almost exactly the same, but the tire websites say "this will not fit your car" even though from other posts I believe that 255 is still ok to not cause any problems when turning. Does the extra 10 mm cause a problem when installing on the 7.5 rims?