63 Dodge Dart, now let me see;)
Here is what a 255 60/R15 looks like on a Torq Thrust II on a B Body with a 8" rim. Sidewall stands up straight.
^^^ 8 3/4 rear end.
Then the newer generation 8" rim with 3/4" more outer face offset. (so actually the backspace decreased by 3/4".)
Was hard to tell by looking at them off the car.
Sidewall still standing up straight, not Ballooned out.
____________
Your 7" rims with 255 60/15s
7" rim with 255 60/R15 sidewall ballooned out, ready to rub.
8" rim will square up that tire and push the excess to the inside.
☆☆☆☆☆
Here is what a 255 60/R15 looks like on a Torq Thrust II on a B Body with a 8" rim. Sidewall stands up straight.
^^^ 8 3/4 rear end.
Then the newer generation 8" rim with 3/4" more outer face offset. (so actually the backspace decreased by 3/4".)
Was hard to tell by looking at them off the car.
Sidewall still standing up straight, not Ballooned out.
____________
Your 7" rims with 255 60/15s
7" rim with 255 60/R15 sidewall ballooned out, ready to rub.
8" rim will square up that tire and push the excess to the inside.
☆☆☆☆☆