this is the tire i have on my back. its a 98 r/t and its dropped 2 inches and i still have room. i know for a fact i can put a 30 in on the back. i cant however go any larger than 255/55 (28 in di.)on the front. but it gives me a nice rake that looks good. i also have 17 in rims so if yer goin on 15s then u gotta do the conversions. click on specs and it will tell u all the tire dimensions. i was gonna go with a 30 in di. tire but there hard to find a good on. http://www.tirerack.com/tires/tires.jsp?tireMake=Bridgestone&tireModel=Dueler+H%2FP+Sport&vehicleSearch=false&partnum=755WR7HPS&fromCompare1=yes&place=1