(65 Barracuda)What is the largest 15" rear tire I can run without tubs/rubbing?

66340SEDAN said
I run 255/60R15's on my 66 Valiant, stock 8 3/4 rear with SS MP springs, both 15x6 and 15x7's rim size work on mine

View attachment 1714934200

What size front tire is that? Great stance. I like it