[Badgerbimmer]

Apex will soon be out with Camaro specific 19" wheels that will allow 305s up front on a ZL1 without spacers. I will likely make the switch. However it got me to thinking going with say 305s on the front and 325s on the back the overall diameter of the wheels/tires will go down 1/2" front and back. Presumably the computer in the car is calibrated for the stock overall wheel diameter. How much impact does this seemingly small change create?