I see most guys seem to go with 60 series tires front and back , which are actually wider and lower profile then 70's, right? I'm in the process of putting 215/65x15 and 235/70x15 on my 69 Swinger using 15x6 front and 15x7 on the back - I have 14x5.5 all around right now. I ordered the 15" wheels from Coker because Wheel Vintiques confirmed that occassionally they have had problems with cap fit with their steelies.