To fit the most rubber and clear big brakes on my 66 Coronet I had to get custom backspace wheels made. 18x8" w/5.5" backspace. 255/45/18" tires. The tire/rim just fits with no rubbing front or rear. The 6 piston Wilwood calipers and 12.19 rotors clear with 1/2" clearance top of the caliper to the rim.