Is there a performance problem with 20" rims at highway speeds? Are they practical for todays road conditions? Can you get them V rated or higher? Anybody with any personal experience?
I had 20's on my 06 with the cervinis kit. You do notice a difference in the ride and feel of the car but Its not a bad ride. I used the car daily and I had no problems at all with them. The car was a little harder to stop with the stock brakes, but it all depends on your plans with the car. If your going to race the car and want great performance than I wouldnt buy 20 inch wheels. But If you want a nice look and a good ride buy the 20's. After there on the car you will get used to them and not notice them anymore. I now am putting 22's on another one Ive got and Im not worried about the ride.
Be carfull with the tire size, I had 285/30/20 many people use that. However it did bottom out a lot with the side exhaust, and the lowered front bumper the cervinis kit has. If you get a 275/35/20 the overall height of the tire is about 1" higher than the 285. They also put 295's on the car but I think they use a 25 series, and again its about 1" lower than the 275. IN the front either 255 or 245 35's work, and are the same height as the 275's. The 285's were actually shorter in height than the front tires, and there was a large wheel gap in the back.
On ebay there is a company Bones who has pictures of a mustang with 315 35 20, and he says they dont rub, but they look a little to big for the car.
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Are 20 inch rims practical? - 
