Tire Size
 

Hey all, Im new to these forums but have purchased many mods for my car 2001 Mustang
gt from AM.Anyway im in the need for some new rear tires, i currantly have mach 1 rims on my car with 255/45/18s the car im not sure what size the rims are 8S or 9S have a a racing suspension and the tires fill up the wells soo i dont wanna really go any taller just wider i all so have the same tire on the front and am wondering whats the widest tire this rim will support, Would like to go wider on the rear.
Thx ,for any advice i could get

cant answer without knowing what the rim width is. I posted a generic answer in your other duplicate thread.