"Well normy, what we got here is the theory of commonality as applioed to the tire buisness,,,,,"", I'm sure Cliff Clavin could explain the variences here! Wild that two same size rated tires vary that much! When ever I get ahead enough to buy tires I will need to go down in the rears on their height and width too! When I got the 48 Ford it had 70's rear fenders mounted, and the beat up original in the bed. I sold the 70's fenders and reinstalled the 48's. losing height and width clearance