Max tire size - 68 dart

As for 275's, they need a 1/2" offset hanger/shackle set up.

69_340_GTS, your car must be effed up because 275's fit all day in a stock tub on a 69 dart with offset hangers. 9.5 to 9.75 will fit on your car WITHOUT offset shackles. Add the offset shackles and the 10.5" section width fits. I've done this on a half dozen 67-69 A bodies so something doesn't add up. You can see by other peoples posts including 72bluNblu who really knows his wheels and tires that it fits their cars too.