I would not drive my CTS Coupe without runflats. Just think of what would happen when you get a flat. Try finding a 275/40/19 tire in stock at a tire dealer.....good luck. I do not notice the difference using run flats. I once had a Corvette and tried non runflats. I had a flat and had to be towed hone on a flatbed wrecker. I will pay the extra cost for runflats.