ill measure backspacing today.
rear tires do not rub frame rails (about 1.5 inches space) or inside quarters but you do need to roll the lip on the quarter if you lower your car.
rubber is as stated 500 miles on tread no burnouts, because right after i got them a head gasket let go so never got the chance to put any miles on them.
front tires are 185/15 p-metrics there is no stated aspect ratio.
keith