My dart runs a 25.5" tire. The absolute largest I could fit would be around 26.5, and it would rub at ride height, let alone with some compression. I've moved my rear end back about 1/2" to make enough room for some tires that are available in a~27" height though. A 28" absolutely will not fit, even with rolling on my car. I'd have to clip the front edge of the opening.