1968 DART how tall front tire??

My Lord, Its like I'm retarded.
15' Cragars, 4.5' wide with 2 1/4' back spacing. Yes, I am looking to run narrow tires that are highway safe. Radial for sure. Sorry for all the vague and scattered post's!

Ugh, that’s like a -12 offset. So even with a 175/80/15 you’d sit pretty close to the fender. You’d have an extra .4” to the fender compared to my 275’s. It’s plenty for clearance at the top of the fenders, but the front lower corner might still be pretty close when turning the wheels. A 175/80/15 would be 26” tall too. That size should work, but I don’t know how much taller than that you could go with those rims. Probably a little bit taller, but I wouldn’t count on a lot especially if you don’t want to trim the flange on the backside of that fender corner.