Installing 15'X8 wide Cragar Mags on a 69 Charger, I'm going to put BF Goodrich TAs on the car. what size tire will be a good size to install? Just a cruzn tire.
If you want the ability to rotate your tires, then go with all four the same. I have found that 255/60R/15's look great on a '69 Charger. I have 15x8 magnums on my Daytona and they fill the wheel wells rather nicely and give a great stance. I've never had issues on tire rub. Now, if you want a slight rake look, then maybe 255's up front and 275's in the rear...
You could easily go as wide as 275's on back (with a 60-series radial), but you'd then lose your rotate-ability if you didn't put the same beefy shoes up front. hemi68charger's recommendation is probably the best. 255's would look really good all the way around.