I have a 2004 SC 430, and recently replaced the Dunlop run flats with non run-flat Bridgestone Potenza RE960AS Pole Position 245/40ZR-18 tires from The Tire Rack. I also went on eBay, ordered and installed the spare.
This mesage is short and to the point: Run as fast as you can to your nearest computer, dial up the Tire Rack, order these tires and install them. Don't ask any questions. Just do it. Tire Rack sends to local tire installers, but be careful that they are ware of the size of the tire sensor so they don't break one.
I was also frustrated with the performance of my car, the horrible tire noise, and a lack of the glidding elegance I would expect from a car of this quality. I also read the Consumer Reports review, and while I was initially offended, wound up agreeing with them.
It's all in the tires. I am an experienced driver, with almost 1,000,000 miles of road time. The difference in performance is night and day.
No longer. These are the best tires I have ever owned. They are extremely quiet; the road is 100% more comfortable; and I finally feel I am in a Lexus.
Cornering and wet pavement performance have been substantially improved, and while I haven't tried 'em in the snow, reports are they do very well.
They are the top rated performance tire on Tire Rack. There is good reason why.
