Lets see some mopar steelies

66340SEDAN said
255/60R15 on 15x6.5 stock C-body rims

Tell me what i am missing here...i have a 66 valiant too, and I measure the rear wheel-well opening at about 10.5".
So how come 8" wide rims are not more popular for that a-body. Looks like most people are running 6.5" wide rims like your self?