My son just got his license and purchased a 2006 Infiniti G 35 coupe. It currently has stock tires and is currently running 225/50/R17 on the front and 235/50/R17 on the back.
He just purchased some 18 inch rims and found some studded 235/45/R18’s.

Will that size fit all the way around without any rubbing, or modifications needed?