I really liked the 19" wheels that were on the GForce concept car, and I finally found the ones that Pontiac used. Does anyone know if the 245/40R19 tire size will fit the '04s? Tire Rack was of no help until they get a car to measure.

Wheel offset will make the difference here. There just isn't much room between the inside tread of the tire and the strut. Changing the offset to move the wheel to the outside would help - but with the stock offset and wheel width, a wider tire may not fit.