[Eyeman]

So you've bought this but not put it on your car yet? That will liely take some work to get it to fit. You will need to run stretched tires and add some camber (the alignment shop can increase your rear camber, in the front someone will need to "pull your pins" unless you get camber plates.

My wheels are the same size but with 7 and 10 mm higher offsets front and rear (listed below in my signature). I finally ended up doing the rear brake hub mod to get my rears to fit better. Also Michelin tires tend to run fuller on the side than tires like Falkens, Toyos, or Nittos.

I'd put the wheels on your car and look at it, cautiously drive it if possible, to help you decide. If you have to buy rear tires without putting it on, etc I'd buy one of the brands above in the size you said, 255/30/19. If you go crazy and decide to buy Michelins to match the fronts, buy 245/30/19. Honestly a 245 Michelin will not look much more stretched than a 255 Falken on a 9.5 inch wheel. I currently have a 245 Michelin PSS tire on a 10inch wide rear wheel on my Porsche.