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BigSky, great post! The less the wheels and tires weigh, the better the suspension will work, and the better the car will ride too. When buying aftermarket wheels, try to avoid those that weigh more than the OEM wheel/tire combo. Im the case of the '06 WRX, the stock 17 X 7 wheel with P215/45-17 RE92s weigh about 42 pounds per wheel/tire. The 17 X 8 OZ Ultraleggeras with Kumho P225/45ZR-17 tires I'm now running weigh in at about 41 lbs., so I was able to shave a pound per corner, get a far better performance tire and a much nicer wheel.
Some of those 18-inch wheels on the market weigh well over 20 lbs. each and though they look great, they will degrade the performance/ride of your car.
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