On my RT I switched from the factory 18's to the Goodyear 20's. The car rides just as smoothly on the road but it seems to me that the 20's will actually break loose a little easier when heavy throttle is applied at low speed. To me they are more fun and the car gets that many more compliments due to the chome on the wheels. Heck it's just all fun and for me that is why I own this car.