[dparm]

The sidewall is an aspect ratio, meaning it is a relative number, not absolute.


275/30R19 means "the sidewall is 30% of the tire's 275mm width" (82.5mm)

255/35R19 means "the sidewall is 35% of the tire's 255 mm width" (89.25mm)


However, you also have more tire sticking into the wheel well now, so if you're rubbing, it might make things even worse. Without posting the wheel offset and suspension setup, everything is going to be a guess. Also, posting this in the wrong forum won't help get you answers quickly.

You don't want AD08Rs for the street. Very poor ride quality (I know from experience) and you won't even be able to use 100% of its performance on public roads anyway. Go for something more reasonable like the Pilot Super Sport, Potenza S04, Conti DW, etc.