Biggest tire under a stock suspension dart????
*** not jacked on my barracuda but isn't the barracuda and dart about the same?
Nope! Barracuda's and Dart's are
not about the same for tire clearance. Not even close.
Barracuda's have over an
inch more room to the quarter than Dart's do. A stock barracuda can easily fit a 275, you can't even get close with a Dart. On most Dart's there's usually about 12" from the inner wheel tub to the quarter lip, on a Barracuda that number is usually a little over 13", which is similar to a Duster, Demon, or Dart Sport. That doesn't account for the springs, which are in the same place on all of the A-bodies. For example, on my '71 Dart there's about 11" from the spring to the quarter lip, that's with the springs in the stock locations and uncut quarter lips.
That's why a 245 is about as wide as you want to go on a Dart with the stock spring locations, because the section width on a 245 is generally 9.8" to 10" depending on the manufacturer (they're not all the same!). So, if perfectly centered you'd only get a 1/2" clearance to the spring and the quarter. The spring clearance is fine, but a 1/2" to the quarter is about the minimum you can get away with without rubbing during normal driving conditions (corners, speed bumps, passengers in the back seat etc). A 255 typically has a section width of about 10.2", which makes it REALLY tight. You still need a 1/2" to the quarter to keep from rubbing, and that only leaves a 1/4" to the springs, which really isn't enough for the tall sidewall on a tire for a 14 or 15" rim . If you trim the quarter lips back it usually works, especially on cars that sit high in the back. But on a bone stock car with stock spring locations and ride height it's not likely to work. And some cars were blessed with a little more clearance from the factory.
