tire size

HI I am trying to figure out what tires will look best on my 70 roadrunner I am going with 15 inch any suggestions?

275/60 on a 15x8 4.5 backspace

Depends on the "look" your after, repro Goodyear PolyGlass GT F60X15's would be the stock OEM type offering...

Aftermarket is quite slim as far as 15" offerings, the most popular being BFG, some GoodYear sizes are still avaliable, personal choice is up to you if you want WLT or blackwall, or if performance is your goal, Pirelli has some P Zero's in 15" sizes still available...

IMHO... 255/60 is the best all around tire up to 8" rims width keepìng stockish and perfomance look mixed. Bigger is something like a SUV or truck. I have those on my 7" Rallye wheels.

FWIW, I had 265/50 & 295/50 tires on 15x8 steelies on one of my Road Runners; they really filled out the wheel wells nicely, and their width kind of scaled down the car's size. But as time wore on, the short sidewalls of a 50-series started to look too short. 70 or 60 series I think provide a better, more cohesive look to my eye.

27560R15 rear 15x8 rim,4.5 backspace
22570r15 front 15x7 rim 4.0 backspace