I had the dry rot porblem on the Potenza RE92A on my 06 Saab too. There were cracks in the middle of the tread area in 2 of the tires and the other two also showed minor cracks too. They were OE and I replaced them last summer. They only had 30K miles on them! They supposed to be good tires. They are expensive too, at $209 each at Tire Rack!