1979 Trans Am P22570R-15 stock tires on 8 wheels. How big can you go with 60 series tires 15 on the front and rear?

Answer

P255-60R-15 if suspension is not worn or sagging , otherwise P245-60R-15 . P255-60R-15's will work on rear regardless . I've seen P275-60R-15's fit on the rear with minor wheelwell clearancing.


Agree with all of that. They look really good too. I ran 255/60/15 all the way around with no problems at all on a '78 T/A